Feature StormVarListError messages

[vEpiphyte]

Make them more useful.

[codecov]

Codecov Report

Merging #2013 (3b5a34e) into master (f8d202f) will decrease coverage by 0.23%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2013      +/-   ##
==========================================
- Coverage   96.83%   96.60%   -0.24%     
==========================================
  Files         147      147              
  Lines       28752    28756       +4     
==========================================
- Hits        27842    27779      -63     
- Misses        910      977      +67     

Flag	Coverage Δ
linux	96.60% <100.00%> (-0.24%)	⬇️
linux_replay	?

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Impacted Files	Coverage Δ
synapse/lib/ast.py	98.22% <100.00%> (+0.09%)	⬆️
synapse/lib/spawn.py	89.20% <0.00%> (-8.26%)	⬇️
synapse/tests/utils.py	93.64% <0.00%> (-2.17%)	⬇️
synapse/cortex.py	95.79% <0.00%> (-0.76%)	⬇️
synapse/lib/hiveauth.py	96.05% <0.00%> (-0.76%)	⬇️
synapse/lib/view.py	94.19% <0.00%> (-0.70%)	⬇️
synapse/lib/trigger.py	93.91% <0.00%> (-0.44%)	⬇️
synapse/common.py	97.43% <0.00%> (-0.29%)	⬇️
synapse/lib/layer.py	98.10% <0.00%> (-0.07%)	⬇️

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