DLT runtimes display fix and issue #182

[souvik-databricks]

This pull request contains the bug fix for the display function for DLT runtimes and the change for github issue #182

[tnixon]

A couple of small changes needed, please see the inline comments.

[tnixon]

Based on our conversation on slack, I think we should be testing for the presence of the DLT library by something like:

def __has_dlt():
  try:
    import dlt
    return true
  except ModuleNotFoundError:
    return false

[codecov]

Codecov Report

Merging #186 (095fd97) into master (30e71eb) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #186      +/-   ##
==========================================
+ Coverage   84.62%   84.63%   +0.01%     
==========================================
  Files           8        8              
  Lines         982      983       +1     
==========================================
+ Hits          831      832       +1     
  Misses        151      151              

Impacted Files	Coverage Δ
tempo/utils.py	50.00% <0.00%> (ø)
tempo/tsdf.py	71.31% <0.00%> (+0.07%)	⬆️

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[tnixon]

Looks good!