Improve delete flow for non-existence _Join collection

[Marco129]

Improvement as stated in #864 @drew-gross's comment

[codecov-io]

Current coverage is 90.90%

Merging #881 into master will decrease coverage by -0.84% as of cf26a59

@@            master   #881   diff @@
=====================================
  Files           71     71       
  Stmts         4108   4110     +2
  Branches       849    849       
  Methods          0      0       
=====================================
- Hit           3769   3736    -33
  Partial         10     10       
- Missed         329    364    +35

Review entire Coverage Diff as of cf26a59

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[drew-gross]

Thank you! Hooray for fewer race conditions!