Don't apply Scope's transaction name if it's empty

[st0012]

Fixes #1540.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.25%. Comparing base (af9803a) to head (1e1b46f).
Report is 732 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1546      +/-   ##
==========================================
+ Coverage   97.89%   98.25%   +0.36%     
==========================================
  Files         222      127      -95     
  Lines       10833     7001    -3832     
==========================================
- Hits        10605     6879    -3726     
+ Misses        228      122     -106     

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