fix and testcase for empty deviation parameter

[frimpler]

In our tests, the <capability> element in <hello> message sporadically contained an empty deviations parameter ("&deviations="). The issue could be reproduced by a test case (test_server_thread.c).
We see the root cause in the missing initialization of v in in nc_server_get_cpblts_version().

Please have a look,
Frank

[codecov-io]

Codecov Report

Merging #140 into devel will increase coverage by 0.21%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##            devel     #140      +/-   ##
==========================================
+ Coverage   37.86%   38.07%   +0.21%     
==========================================
  Files          23       23              
  Lines        9922     9927       +5     
  Branches     1947     1947              
==========================================
+ Hits         3757     3780      +23     
+ Misses       5233     5202      -31     
- Partials      932      945      +13

Impacted Files	Coverage Δ
src/session.c	40.55% <ø> (+2.02%)	⬆️
tests/test_server_thread.c	94.07% <100%> (+0.08%)	⬆️
tests/test_fd_comm.c	94.06% <0%> (-0.46%)	⬇️
src/session_server_tls.c	28.24% <0%> (-0.11%)	⬇️
src/io.c	45.47% <0%> (+0.26%)	⬆️
src/session_client.c	24.93% <0%> (+0.27%)	⬆️

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[michalvasko]

Hi,
that is clearly a bug, thanks for the fix and test.

Regards,
Michal