fix: handle NoCachedDataException

Author: PavloNetrebchuk

course/src/main/java/org/openedx/course/presentation/offline/CourseOfflineViewModel.kt

@@ -80,29 +80,31 @@ class CourseOfflineViewModel(
 
     fun downloadAllBlocks(fragmentManager: FragmentManager) {
         viewModelScope.launch {
-            val courseStructure = courseInteractor.getCourseStructureFromCache(courseId)
-            val downloadModels = courseInteractor.getAllDownloadModels()
-            val subSectionsBlocks = allBlocks.values.filter { it.type == BlockType.SEQUENTIAL }
-            val notDownloadedSubSectionBlocks = subSectionsBlocks.mapNotNull { subSection ->
-                val verticalBlocks = allBlocks.values.filter { it.id in subSection.descendants }
-                val notDownloadedBlocks = courseStructure.blockData.filter { block ->
-                    block.id in verticalBlocks.flatMap { it.descendants } &&
-                            block.isDownloadable &&
-                            downloadModels.none { it.id == block.id }
+            runCatching {
+                val courseStructure = courseInteractor.getCourseStructureFromCache(courseId)
+                val downloadModels = courseInteractor.getAllDownloadModels()
+                val subSectionsBlocks = allBlocks.values.filter { it.type == BlockType.SEQUENTIAL }
+                val notDownloadedSubSectionBlocks = subSectionsBlocks.mapNotNull { subSection ->
+                    val verticalBlocks = allBlocks.values.filter { it.id in subSection.descendants }
+                    val notDownloadedBlocks = courseStructure.blockData.filter { block ->
+                        block.id in verticalBlocks.flatMap { it.descendants } &&
+                                block.isDownloadable &&
+                                downloadModels.none { it.id == block.id }
+                    }
+                    if (notDownloadedBlocks.isNotEmpty()) subSection else null
                 }
-                if (notDownloadedBlocks.isNotEmpty()) subSection else null
-            }
 
-            downloadDialogManager.showPopup(
-                subSectionsBlocks = notDownloadedSubSectionBlocks,
-                courseId = courseId,
-                isBlocksDownloaded = false,
-                fragmentManager = fragmentManager,
-                removeDownloadModels = ::removeDownloadModels,
-                saveDownloadModels = { blockId ->
-                    saveDownloadModels(fileUtil.getExternalAppDir().path, courseId, blockId)
-                }
-            )
+                downloadDialogManager.showPopup(
+                    subSectionsBlocks = notDownloadedSubSectionBlocks,
+                    courseId = courseId,
+                    isBlocksDownloaded = false,
+                    fragmentManager = fragmentManager,
+                    removeDownloadModels = ::removeDownloadModels,
+                    saveDownloadModels = { blockId ->
+                        saveDownloadModels(fileUtil.getExternalAppDir().path, courseId, blockId)
+                    }
+                )
+            }
         }
     }
 
@@ -153,11 +155,11 @@ class CourseOfflineViewModel(
     }
 
     private suspend fun initDownloadFragment() {
-        val courseStructure = courseInteractor.getCourseStructureFromCache(courseId)
-        setBlocks(courseStructure.blockData)
-        allBlocks.values
-            .filter { it.type == BlockType.SEQUENTIAL }
-            .forEach { addDownloadableChildrenForSequentialBlock(it) }
+            val courseStructure = courseInteractor.getCourseStructureFromCache(courseId)
+            setBlocks(courseStructure.blockData)
+            allBlocks.values
+                .filter { it.type == BlockType.SEQUENTIAL }
+                .forEach { addDownloadableChildrenForSequentialBlock(it) }
     }
 
     private fun getOfflineData() {