Genpkg / rapid powerup fixes (SYN-4492, SYN-4493)

[vEpiphyte]

• genpkg raise error with nonexistent path
• fix powerup directory example

[codecov]

Codecov Report

Base: 97.17% // Head: 97.06% // Decreases project coverage by -0.11% ⚠️

Coverage data is based on head (175a6fb) compared to base (20d1eda).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2941      +/-   ##
==========================================
- Coverage   97.17%   97.06%   -0.12%     
==========================================
  Files         215      215              
  Lines       42126    42113      -13     
==========================================
- Hits        40937    40878      -59     
- Misses       1189     1235      +46     

Flag	Coverage Δ
linux	97.06% <100.00%> (-0.01%)	⬇️
linux_replay	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
synapse/tools/genpkg.py	100.00% <100.00%> (ø)
synapse/tests/utils.py	94.46% <0.00%> (-1.89%)	⬇️
synapse/cortex.py	96.50% <0.00%> (-0.57%)	⬇️
synapse/lib/hiveauth.py	96.01% <0.00%> (-0.48%)	⬇️
synapse/lib/trigger.py	95.01% <0.00%> (-0.39%)	⬇️
synapse/lib/view.py	97.00% <0.00%> (-0.34%)	⬇️
synapse/cmds/cron.py	97.56% <0.00%> (-0.25%)	⬇️
synapse/lib/jsonstor.py	98.32% <0.00%> (-0.24%)	⬇️
synapse/lib/lmdbslab.py	99.53% <0.00%> (-0.19%)	⬇️
synapse/axon.py	98.73% <0.00%> (-0.15%)	⬇️
... and 11 more

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