Misc. small fixes and improvements

[AdeelH]

Overview

This PR makes misc. small fixes and improvements.

Checklist

• Added unit tests, if applicable
• Updated documentation, if applicable
• Added needs-backport label if the change should be back-ported to the previous release
• PR has a name that won't get you publicly shamed for vagueness

Notes

N/A

Testing Instructions

See unit tests

[codecov]

Codecov Report

Attention: Patch coverage is 82.22222% with 8 lines in your changes missing coverage. Please review.

Project coverage is 90.38%. Comparing base (bb01d48) to head (fcb3f29).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
...sion_core/rastervision/core/data/utils/rasterio.py	16.66%	5 Missing ⚠️
...ipeline/rastervision/pipeline/file_system/utils.py	90.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2279   +/-   ##
=======================================
  Coverage   90.38%   90.38%           
=======================================
  Files         199      199           
  Lines        9995     9999    +4     
=======================================
+ Hits         9034     9038    +4     
  Misses        961      961           

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