message: Hide Duration text field if the content is empty (mac)
diff: @@ -291,10 +291,12 @@ NSString *kInactiveTimerColor = @"#999999";
  // Display duration
  if (self.time_entry.duration != nil)
  {
  + self.durationTextField.hidden = NO;
  self.durationTextField.stringValue = self.time_entry.duration;
  }
  else
  {
  + self.durationTextField.hidden = YES;
  self.durationTextField.stringValue = @"";
  }
  @@ -373,6 +375,7 @@ NSString *kInactiveTimerColor = @"#999999";
  - (void)clear
  {
  + self.durationTextField.hidden = YES;
  self.durationTextField.stringValue = @"";
  self.autoCompleteInput.stringValue = @"";
  [self.autoCompleteInput resetTable];
  @@ -428,6 +431,7 @@ NSString *kInactiveTimerColor = @"#999999";
  NSString *newValue = [NSString stringWithUTF8String:str];
  free(str);
  [self.durationTextField setStringValue:newValue];
  + self.durationTextField.hidden = newValue.length == 0;
  }
  - (IBAction)autoCompleteChanged:(id)sender
  @@ -514,6 +518,7 @@ NSString *kInactiveTimerColor = @"#999999";
  free(str);
  [self.durationTextField setStringValue:newValue];
  + self.durationTextField.hidden = newValue.length == 0;
  // Update
  [[NSNotificationCenter defaultCenter] postNotificationName:@"TimerForRunningTimeEntryOnTicket" object:nil];
  