If a parsed column name is empty (i.e. zero length), then generate a …

[quinnj]

…column name. Fixes #530

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@e95bbe7). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #535   +/-   ##
=========================================
  Coverage          ?   82.83%           
=========================================
  Files             ?        7           
  Lines             ?     1439           
  Branches          ?        0           
=========================================
  Hits              ?     1192           
  Misses            ?      247           
  Partials          ?        0

Impacted Files	Coverage Δ
src/detection.jl	88.76% <100%> (ø)

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