Fix support renaming of usages of function without calls

[browniebroke]

No description provided.

[sourcery-ai]

Sourcery Code Quality Report (beta)

❌  Merging this PR will decrease code quality in the affected files by 0.01 out of 10.

Quality metrics	Before	After	Change
Complexity	0.54	0.56	0.02 🔴
Method Length	22.14	22.33	0.19 🔴
Quality	9.40	9.39	-0.01 🔴

Other metrics	Before	After	Change
Lines	309	344	35

Changed files	Quality Before	Quality After	Quality Change
django_codemod/visitors/base.py	9.32	9.32	0.00
tests/visitors/test_base.py	9.50	9.51	0.01 🔵

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Overall	Recommendation

Please see our documentation here for details on how these metrics are calculated.

We are actively working on this report - lots more documentation and extra metrics to come!

Let us know what you think of it by mentioning @sourcery-ai in a comment.

[codecov]

Codecov Report

Merging #197 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #197   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           20        20           
  Lines          602       618   +16     
=========================================
+ Hits           602       618   +16     

Impacted Files	Coverage Δ
django_codemod/visitors/base.py	100.00% <100.00%> (ø)

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