TST: don't catch, but supress warnings in panel4d/panelnd

[jreback]

No description provided.

[codecov]

Codecov Report

Merging #15705 into master will decrease coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #15705      +/-   ##
==========================================
- Coverage   91.03%      91%   -0.03%     
==========================================
  Files         143      143              
  Lines       49411    49416       +5     
==========================================
- Hits        44979    44971       -8     
- Misses       4432     4445      +13

Impacted Files	Coverage Δ
pandas/core/categorical.py	96.89% <ø> (ø)	✅
pandas/io/pytables.py	93.06% <100%> (+0.01%)	✅
pandas/io/gbq.py	25% <0%> (-58.34%)	❌
pandas/computation/pytables.py	90.75% <0%> (-0.85%)	❌
pandas/tools/merge.py	93.68% <0%> (-0.34%)	❌
pandas/core/frame.py	97.87% <0%> (-0.1%)	❌
pandas/core/common.py	91.3% <0%> (+0.33%)	✅

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