Show empty diffs as patch, not text

[gerhardol]

Fixes #5547

Proposed changes

• A null patch was displayed as a text file instead of a patch, so the toolbar was missing

Screenshots

Before

After

Test methodology

Manual

✒️ I contribute this code under The Developer Certificate of Origin.

[codecov]

Codecov Report

Merging #8482 into master will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #8482      +/-   ##
==========================================
- Coverage   53.97%   53.93%   -0.04%     
==========================================
  Files         883      879       -4     
  Lines       63499    63461      -38     
  Branches    11375    11375              
==========================================
- Hits        34271    34227      -44     
- Misses      26559    26562       +3     
- Partials     2669     2672       +3     

Flag	Coverage Δ
#production	41.07% <0.00%> (-0.02%)	⬇️
#tests	94.72% <ø> (-0.01%)	⬇️

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[gerhardol]

@msftbot merge in 24 hours

[ghost]

Hello @gerhardol!

Because you've given me some instructions on how to help merge this pull request, I'll be modifying my merge approach. Here's how I understand your requirements for merging this pull request:

• I won't merge this pull request until after the UTC date Sun, 27 Sep 2020 20:25:17 GMT, which is in 1 day

If this doesn't seem right to you, you can tell me to cancel these instructions and use the auto-merge policy that has been configured for this repository. Try telling me "forget everything I just told you".