remove NaN values in RinexNav

[betaBison]

• Removes NaN rows that georinex outputs when parsing Rinex Nav data files
• Fixes rinex_nav: Incorrect time of clock #155

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c9457b1) 99.56% compared to head (ec70614) 99.56%.

Additional details and impacted files

@@           Coverage Diff           @@
##           v1.0.2     #156   +/-   ##
=======================================
  Coverage   99.56%   99.56%           
=======================================
  Files          21       21           
  Lines        2980     2980           
=======================================
  Hits         2967     2967           
  Misses         13       13           

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[danineamati]

Looks good.