misc: Fixup Profiler.add_global_vanilla

[FabioLuporini]

No description provided.

[georgebisbas]

Thought I had fixed this !
I guess it is due to the zero-sized subdomain test?

[FabioLuporini]

no some kernels in PRO producing traffic=0, but we don't want the whole performance entry to be dropped 😬

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 87.29%. Comparing base (f54378d) to head (5933c80).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
devito/operator/profiling.py	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2494   +/-   ##
=======================================
  Coverage   87.29%   87.29%           
=======================================
  Files         238      238           
  Lines       45379    45379           
  Branches     4029     4029           
=======================================
  Hits        39615    39615           
  Misses       5083     5083           
  Partials      681      681           

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[EdCaunt]

Uncontroversial