MOBILE-4348 resource: Fix unloaded filetype icon

src/addons/mod/resource/services/handlers/module.ts

@@ -25,6 +25,7 @@ import { makeSingleton, Translate } from '@singletons';
 import { AddonModResourceIndexComponent } from '../../components/index';
 import { AddonModResource } from '../resource';
 import { AddonModResourceHelper } from '../resource-helper';
+import { CoreSitesReadingStrategy } from '@services/sites';
 
 /**
  * Handler to support resource modules.
@@ -108,6 +109,16 @@ export class AddonModResourceModuleHandlerService extends CoreModuleHandlerBase
         }
 
         try {
+
+            if (!module.contentsinfo && !module.contents) {
+                // Contents are not loaded on LMS 3.5 and 3.6.
+                await AddonModResource.getResourceData(
+                    module.course,
+                    module.id,
+                    { readingStrategy: CoreSitesReadingStrategy.PREFER_CACHE },
+                );
+            }
+
             handlerData.icon = this.getIconSrc(module);
         } catch {
             // Ignore errors.
@@ -158,7 +169,7 @@ export class AddonModResourceModuleHandlerService extends CoreModuleHandlerBase
                 mimetypeIcon = CoreMimetypeUtils.getMimetypeIcon(mimetype);
             }
 
-        } else if (module.contents && module.contents[0]) {
+        } else if (module.contents?.[0]) {
             const files = module.contents;
             const file = files[0];