Adds comment related to zero-sized matrix B in GELSY

[weslleyspereira]

Closes #258.
Closes #259.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (1fafb88) 0.00% compared to head (1b7b96f) 0.00%.

❗ Current head 1b7b96f differs from pull request most recent head b788b4a. Consider uploading reports for the commit b788b4a to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           master     #833    +/-   ##
========================================
  Coverage    0.00%    0.00%            
========================================
  Files        1908     1908            
  Lines      187072   186958   -114     
========================================
+ Misses     187072   186958   -114     

Impacted Files	Coverage Δ
SRC/cgbsvx.f	0.00% <ø> (ø)
SRC/cgebal.f	0.00% <0.00%> (ø)
SRC/cgees.f	0.00% <ø> (ø)
SRC/cgeesx.f	0.00% <ø> (ø)
SRC/cgeev.f	0.00% <ø> (ø)
SRC/cgeevx.f	0.00% <ø> (ø)
SRC/cgejsv.f	0.00% <ø> (ø)
SRC/cgels.f	0.00% <ø> (ø)
SRC/cgelsd.f	0.00% <ø> (ø)
SRC/cgelss.f	0.00% <ø> (ø)
... and 242 more

... and 3 files with indirect coverage changes

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