antool: do not add empty paths to pmem paths

[ldorau]

This change is 

[codecov[bot]]

Codecov Report

Merging #368 into master will increase coverage by 0.02%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #368      +/-   ##
==========================================
+ Coverage   76.94%   76.97%   +0.02%     
==========================================
  Files          67       67              
  Lines        8228     8230       +2     
  Branches     1649     1650       +1     
==========================================
+ Hits         6331     6335       +4     
  Misses       1488     1488              
+ Partials      409      407       -2

Flag	Coverage Δ
#ltp_tests	46.57% <ø> (+0.01%)	:arrow_up:
#sqlite_tests	45.34% <ø> (+0.01%)	:arrow_up:
#tests_antool	14.79% <100%> (+0.02%)	:arrow_up:
#tests_posix_multi_threaded	25.63% <ø> (-0.02%)	:arrow_down:
#tests_posix_single_threaded	54.23% <ø> (-0.03%)	:arrow_down:
#tests_preload	44.93% <ø> (+0.07%)	:arrow_up:

Impacted Files	Coverage Δ
src/tools/antool/listsyscalls.py	99.44% <100%> (ø)	:arrow_up:
src/libpmemfile-posix/dir.c	85.25% <0%> (+0.24%)	:arrow_up:
src/libpmemfile-posix/inode.c	88.65% <0%> (+0.34%)	:arrow_up:

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[sarahjelinek]

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Reviewed 2 of 2 files at r1. Review status: all files reviewed at latest revision, all discussions resolved.

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