###

### Steps to reproduce

1. Login and open a work package containing a non-existing macro such as `workPackageValue:10917:`


### What is the buggy behavior?

* I only see a blank button with a dash


<img class="image_resized op-uc-image op-uc-image_inline" style="width:453px;" src="/api/v3/attachments/757755/content">

### What is the expected behavior?

1. I would like to see a clear error message just like on web:


<img class="image_resized op-uc-image op-uc-image_inline" style="width:502px;" src="/api/v3/attachments/757757/content">

Begin of the insertion* Use the text in cursive &quot;Cannot expand macro&quot; when there is this kind of errors on mobile.


End of the insertion ### Environment information

**OpenProject version**

**1.6.0-alpha (379)**

**Operating System**

* [ ] Windows
* [ ] Mac OS X
* [x] Mobile iOS
* [ ] Mobile Android
* [ ] Linux (please specify distro)
* [ ] Chrome OS
* [ ] Other (please specify)