title: CKModifyRecordsOperation modifyRecordsCompletionBlock not being called
body: <p>I'm using <code>CKModifyRecordsOperation</code> to save a set of records and if I have internet connection all works well and completion block is being called. But when I don't have connection the completion block is not being called and I don't get any information that my operations failed.</p>
  
  <p>I'm using the following code in completion block</p>
  
  <pre><code>modifyOperations.modifyRecordsCompletionBlock = ^(NSArray *savedRecords, NSArray *deletedRecordIDs, NSError *error)
  {
      if(error){
          NSLog(@"Error: %@", error.localizedDescription);
      }
  
      item.creatorRecordId = record.recordID;
  };
  </code></pre>
  
  <p>and then I'm performing operation using</p>
  
  <pre><code>[self.publicDB addOperation:modifyOperations];
  </code></pre>
  
  <p>Any ideas how can I get an information if the operation failed for example in the case where there is no internet connection?</p>