Glance needs to handle data with no fill value gracefully.
When you try to analyze a variable that has no fill value defined Glance will crash with an assertion error. This is not a graceful way to handle data analysis, so regardless of whether we consider this to be faulty data, we shouldn't be crashing.
Here is an example assertion error traceback from Ray:
Traceback (most recent call last):
File "/opt/conda/envs/glance/bin/glance", line 33, in <module>
sys.exit(load_entry_point('uwglance==0.4.2', 'console_scripts', 'glance')())
File "/opt/conda/envs/glance/lib/python3.8/site-packages/uwglance-0.4.2-py3.8.egg/glance/compare.py", line 1613, in main
rc = lower_locals[args[0].lower()](*args[1:])
File "/opt/conda/envs/glance/lib/python3.8/site-packages/uwglance-0.4.2-py3.8.egg/glance/compare.py", line 1394, in reportGen
return reportGen_library_call(a_path, b_path, args[2:], tempOptions)
File "/opt/conda/envs/glance/lib/python3.8/site-packages/uwglance-0.4.2-py3.8.egg/glance/compare.py", line 843, in reportGen_library_call
variable_stats = statistics.StatisticalAnalysis.withSimpleData(aData, bData,
File "/opt/conda/envs/glance/lib/python3.8/site-packages/uwglance-0.4.2-py3.8.egg/glance/stats.py", line 880, in withSimpleData
diffInfo = dataobj.DiffInfoObject(aDataObject, bDataObject,
File "/opt/conda/envs/glance/lib/python3.8/site-packages/uwglance-0.4.2-py3.8.egg/glance/data.py", line 326, in __init__
self.diff_data_object = DiffInfoObject.analyze(aDataObject, bDataObject,
File "/opt/conda/envs/glance/lib/python3.8/site-packages/uwglance-0.4.2-py3.8.egg/glance/data.py", line 416, in analyze
assert(fill_data_value is not None)
AssertionError