Avoid segfaults on 1.5-upgraded installations before 10e6c71 [WiP]

[x4m]

[codecov[bot]]

Codecov Report

Merging #212 into master will decrease coverage by 0.27%. The diff coverage is 84.31%.

@@            Coverage Diff             @@
##           master     #212      +/-   ##
==========================================
- Coverage   91.74%   91.47%   -0.28%     
==========================================
  Files          43       40       -3     
  Lines        6386     7058     +672     
==========================================
+ Hits         5859     6456     +597     
- Misses        527      602      +75     

Impacted Files	Coverage Δ
src/compat/pg_compat.c	74.61% <ø> (-7.89%)	:arrow_down:
src/include/init.h	83.33% <ø> (ø)
src/include/pathman.h	100.00% <ø> (ø)
src/include/rangeset.h	100.00% <ø> (ø)
src/include/relation_info.h	90.00% <ø> (-1.31%)	:arrow_down:
src/runtime_merge_append.c	69.07% <ø> (+1.12%)	:arrow_up:
src/partition_router.c	75.00% <14.70%> (-11.17%)	:arrow_down:
src/pg_pathman.c	95.38% <80.76%> (-0.65%)	:arrow_down:
src/pl_range_funcs.c	96.47% <83.33%> (-0.31%)	:arrow_down:
src/utility_stmt_hooking.c	92.16% <84.61%> (+0.35%)	:arrow_up:
... and 51 more

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