IOS-7932: Fix photo upload operation crash

Author: rdu-mega

iMEGA/Camera uploads/UploadManagers/ImageExportManager.m

@@ -74,6 +74,11 @@ - (void)exportImageAtURL:(NSURL *)imageURL dataTypeUTI:(NSString *)dataUTI toURL
 
 - (NSOperationQueue *)exportQueueForDataUTI:(NSString *)dataUTI outputTypeUTI:(NSString *)outputUTI {
     NSOperationQueue *queue = self.generalExportOperationQueue;
+    
+    if (dataUTI == nil) {
+        return queue;
+    }
+    
     if ([[UTType typeWithIdentifier:dataUTI] conformsToType:UTTypeHEIC]) {
         if (outputUTI.length == 0 || [dataUTI isEqualToString:outputUTI]) {
             queue = self.HEICExportOperationQueue;

iMEGA/Camera uploads/UploadOperations/PhotoUploadOperation.m

@@ -155,7 +155,12 @@ - (void)exportImageAtURL:(NSURL *)URL dataUTI:(NSString *)dataUTI dataInfo:(NSDi
 }
 
 - (BOOL)shouldConvertToJPGForUTI:(NSString *)dataUTI {
-    return [CameraUploadManager shouldConvertHEICPhoto] && [[UTType typeWithIdentifier:dataUTI] conformsToType: UTTypeHEIC];
+    if (dataUTI != nil) {
+        UTType *type = [UTType typeWithIdentifier:dataUTI];
+        return [CameraUploadManager shouldConvertHEICPhoto] && [type conformsToType: UTTypeHEIC];
+    }
+    
+    return false;
 }
 
 - (UploadQueueType)uploadQueueType {