Added fail-safe

app/src/main/java/eu/faircode/email/Core.java

@@ -2041,6 +2041,7 @@ class Core {
                 " fetched in " + duration + " ms");
 
         // Check if system folders were renamed
+        try {
             for (Folder ifolder : ifolders) {
                 String fullName = ifolder.getFullName();
                 if (TextUtils.isEmpty(fullName))
@@ -2083,6 +2084,9 @@ class Core {
                     }
                 }
             }
+        } catch (Throwable ex) {
+            Log.e(ex);
+        }
 
         Map<String, EntityFolder> nameFolder = new HashMap<>();
         Map<String, List<EntityFolder>> parentFolders = new HashMap<>();