An error occurred while processing the template.
The following has evaluated to null or missing:
==> request['theme-display']  [in template "20116#20152#294831" at line 1, column 47]

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Tip: It's the final [] step that caused this error, not those before it.
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Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
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FTL stack trace ("~" means nesting-related):
	- Failed at: #assign images_folder = getterUtil.ge...  [in template "20116#20152#294831" at line 1, column 1]
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1<#assign images_folder = getterUtil.getString(request['theme-display']['path-theme-images'])> 
2<div class="project-detail light-grey"> 
3    <#if immagine?? && immagine.getData() != '' > 
4        <div class="swiper-container"> 
5            <div class="swiper-wrapper"> 
6                <div class="swiper-slide"> 
7                    <div class="swipe-background" style="background-image:url('${immagine.getData()}')"> 
8                    </div> 
9                </div> 
10            </div> 
11        </div> 
12   <#else> 
13       <div class="swiper-container"> 
14           <div class="swiper-wrapper"> 
15               <div class="swiper-slide"> 
16                   <div class="swipe-background" style="background-image:url('${images_folder}/swiper/default-news-image.jpg')"> 
17                   </div> 
18               </div> 
19           </div> 
20       </div> 
21   </#if> 
22 
23    <div class="container"> 
24        <#-- 
25            Versione senza img di copertina 
26        --> 
27 
28        <#-- 
29        <#if immagine.getData()?? > 
30            <div class="project-detail__content-wrapper"> 
31        <#else> 
32            <div class="project-detail__content-wrapper project-detail__content-wrapper--no-image"> 
33        </#if> 
34        --> 
35        <div class="project-detail__content-wrapper"> 
36            <#if pageGeneratorParentFriendlyUrl?? && validator.isNotNull(pageGeneratorParentFriendlyUrl.getData())> 
37                <div class="project-detail__back-wrapper"> 
38                    <a href="${pageGeneratorParentFriendlyUrl.data}" class="project-detail__back"> 
39                       <i class="icon-angle-left"></i>${languageUtil.get(locale, "territori.torna_indietro")} 
40                    </a> 
41                </div> 
42            </#if> 
43            <div class="project-detail__title-wrapper"> 
44                <div class="project-detail__title color-primary"> 
45                    ${titolo.getData()} 
46                </div> 
47 
48            </div> 
49            <div class="project-detail__main-content"> 
50                <div class="project-detail__content"> 
51                    <div class="row"> 
52                        <#if galleria?? && galleria.getSiblings()?has_content && validator.isNotNull((galleria.getSiblings()?first).getData())> 
53                            <div class="col-md-8"> 
54                                ${testo.getData()} 
55                            </div> 
56                            <div class="col-md-4"> 
57                                <div class="project-detail__image-list"> 
58                                    <#list galleria.getSiblings() as cur_galleria> 
59                                        <#if cur_galleria.getData()?? && cur_galleria.getData() != ""> 
60                                            <a href="${cur_galleria.getData()}" 
61                                               data-fancybox="galleria" 
62                                               data-caption="${cur_galleria.getAttribute("alt")}"> 
63                                                <img class="project-detail__image img-responsive" 
64                                                     src="${cur_galleria.getData()}" 
65                                                     alt="${cur_galleria.getAttribute("alt")}"> 
66                                            </a> 
67                                         </#if> 
68                                    </#list> 
69                                </div> 
70                            </div> 
71                        <#else> 
72                            <div class="col-md-12"> 
73                                ${testo.getData()} 
74                            </div> 
75                        </#if> 
76                    </div> 
77                </div> 
78            </div> 
79        </div> 
80    </div> 
81</div>