Bug runt synformpivot

[vEpiphyte]

Fix form pivot support for runt type forms.

[codecov]

Codecov Report

Merging #1470 into master will decrease coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1470      +/-   ##
==========================================
- Coverage   95.41%   95.36%   -0.05%     
==========================================
  Files         133      133              
  Lines       20495    20494       -1     
==========================================
- Hits        19555    19544      -11     
- Misses        940      950      +10

Flag	Coverage Δ
#linux	95.36% <100%> (-0.02%)	⬇️
#osx	?

Impacted Files	Coverage Δ
synapse/lib/ast.py	95.05% <100%> (-0.01%)	⬇️
synapse/lib/platforms/darwin.py	0% <0%> (-100%)	⬇️
synapse/lib/thisplat.py	58.33% <0%> (-8.34%)	⬇️
synapse/lib/base.py	91.05% <0%> (-1%)	⬇️
synapse/lib/link.py	98.54% <0%> (-0.73%)	⬇️
synapse/lib/lmdbslab.py	98.91% <0%> (-0.16%)	⬇️

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