Pull request to fix issue 244

[indiscrete-void]

I added guard code for case when provided length is zero in PseudoTcpInputStream#read

Idk if guard code from length == 0 should be placed on lower level than PseudoTcpInputStream#read, it's for you to decide if it should be in PseudoTCPBase#recv (or lower)

[jitsi-jenkins]

Hi, thanks for your contribution!
If you haven't already done so, could you please make sure you sign our CLA (https://jitsi.org/icla for individuals and https://jitsi.org/ccla for corporations)? We would unfortunately be unable to merge your patch unless we have that piece :(.

[codecov]

Codecov Report

Merging #245 (e9fb5ef) into master (64a7ca8) will increase coverage by 0.15%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #245      +/-   ##
============================================
+ Coverage     38.60%   38.75%   +0.15%     
- Complexity     1351     1352       +1     
============================================
  Files           178      178              
  Lines         12142    12144       +2     
  Branches       1836     1837       +1     
============================================
+ Hits           4688     4707      +19     
+ Misses         6802     6779      -23     
- Partials        652      658       +6     

Impacted Files	Coverage Δ
.../java/org/ice4j/pseudotcp/PseudoTcpSocketImpl.java	65.32% <0.00%> (-0.09%)	⬇️
...in/java/org/ice4j/ice/ConnectivityCheckClient.java	55.62% <0.00%> (-2.44%)	⬇️
...in/java/org/ice4j/stack/StunClientTransaction.java	81.55% <0.00%> (-1.95%)	⬇️
src/main/java/org/ice4j/ice/CandidatePair.java	67.91% <0.00%> (-1.50%)	⬇️
src/main/java/org/ice4j/message/Message.java	49.81% <0.00%> (-0.74%)	⬇️
...c/main/java/org/ice4j/pseudotcp/PseudoTCPBase.java	64.00% <0.00%> (+0.15%)	⬆️
...org/ice4j/socket/MultiplexingXXXSocketSupport.java	52.12% <0.00%> (+0.60%)	⬆️
src/main/java/org/ice4j/ice/Agent.java	56.08% <0.00%> (+1.28%)	⬆️
src/main/java/org/ice4j/util/PeriodicRunnable.java	75.75% <0.00%> (+1.51%)	⬆️
... and 3 more

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