Fixed self reference loop

[TheBurchLog]

If a client was self referencing, then it would cause an infinite loop trying to find the current namespace counter, because it wasn't defined.

[codecov]

Codecov Report

Attention: 48 lines in your changes are missing coverage. Please review.

Comparison is base (a738e1c) 94.26% compared to head (4cea5e5) 93.14%.
Report is 6 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #413      +/-   ##
===========================================
- Coverage    94.26%   93.14%   -1.13%     
===========================================
  Files           26       27       +1     
  Lines         3452     3588     +136     
===========================================
+ Hits          3254     3342      +88     
- Misses         198      246      +48     

Files	Coverage Δ
brewtils/__init__.py	80.00% <100.00%> (+1.42%)	⬆️
brewtils/__version__.py	100.00% <100.00%> (ø)
brewtils/rest/client.py	93.84% <100.00%> (ø)
brewtils/plugin.py	96.27% <50.00%> (-0.27%)	⬇️
brewtils/rest/system_client.py	92.48% <33.33%> (-6.87%)	⬇️
brewtils/auto_decorator.py	23.80% <23.80%> (ø)
brewtils/decorators.py	90.72% <80.61%> (-5.22%)	⬇️

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