Fix Landsat no-data issues

[lukasValentin]

The Landsat sensor class has been updated to address the bugs found in #84. To do so, the no-nodata checking in the Band class has been improved further. The Band.from_rasterio method will now raise a TypeError in case no no-data value is provided to ensure that there is always a no-data value.

[codecov]

Codecov Report

Merging #85 (d4f2bac) into master (ddbf786) will increase coverage by 0.86%.
The diff coverage is 78.57%.

@@            Coverage Diff             @@
##           master      #85      +/-   ##
==========================================
+ Coverage   56.75%   57.61%   +0.86%     
==========================================
  Files          68       68              
  Lines        5286     5290       +4     
  Branches     1060     1060              
==========================================
+ Hits         3000     3048      +48     
+ Misses       1979     1940      -39     
+ Partials      307      302       -5     

Flag	Coverage Δ
unittests	57.61% <78.57%> (+0.86%)	⬆️

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Files	Coverage Δ
eodal/core/band.py	75.98% <100.00%> (+0.35%)	⬆️
eodal/core/sensors/landsat.py	70.20% <62.50%> (+16.67%)	⬆️

... and 1 file with indirect coverage changes

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