Do not error when rendering edl files

[jsouter]

Disables the error, DLSFormatter provides working widgets for at least bools, enums, ints and floats currently. We may need to alter this message after the image viewer changes to PVI go through, this change would be convenient for me to have to help render simple edl screens for a few FastCS iocs I have running on P38.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.36%. Comparing base (7ddd7d2) to head (78fb218).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/fastcs/transport/epics/gui.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #271   +/-   ##
=======================================
  Coverage   89.35%   89.36%           
=======================================
  Files          45       45           
  Lines        2273     2275    +2     
=======================================
+ Hits         2031     2033    +2     
  Misses        242      242           

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