Fix issue #305. Gracefully handle empty input files.

[troyraen]

Closes #305

Fixes an issue where hipscat-import throws an error when an input file is empty.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.52%. Comparing base (1555ca2) to head (898e093).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #309   +/-   ##
=======================================
  Coverage   99.52%   99.52%           
=======================================
  Files          25       25           
  Lines        1274     1274           
=======================================
  Hits         1268     1268           
  Misses          6        6           

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