SpaceList: Fix a crash when clearing cache or logout.

Riot/Modules/Spaces/SpaceList/SpaceListViewModel.swift

@@ -131,6 +131,9 @@ final class SpaceListViewModel: SpaceListViewModelType {
     
     private func loadData() {
         guard let session = self.userSessionsService.mainUserSession?.matrixSession else {
+            // If there is no main session, reset current selection and give an empty section list
+            // It can happen when the user make a clear cache or logout 
+            self.resetList()
             return
         }
 
@@ -243,4 +246,15 @@ final class SpaceListViewModel: SpaceListViewModelType {
             return spaceViewData.spaceId
         }
     }
+    
+    private func resetList() {
+        self.sections = []
+        
+        let selectedIndexPath = IndexPath(row: 0, section: 0)
+        
+        self.selectedIndexPath = selectedIndexPath
+        self.homeIndexPath = selectedIndexPath
+        
+        self.update(viewState: .loaded([]))
+    }
 }