Bug in TeamCity reporter throws exception when reporting a failure with empty "output"

[loufranco]

I can reproduce call stacks like this in TeamCity when I make build mistakes (there is really a build error, but I can't see it)

It's an easy fix -- PR coming.

[14:23:04][Step 6/11] 2015-07-09 14:23:04.523 teamcity[55363:11783837] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSCFConstantString substringToIndex:]: Index 1 out of bounds; string length 0'
[14:23:04][Step 6/11] *** First throw call stack:
[14:23:04][Step 6/11] (
[14:23:04][Step 6/11]   0   CoreFoundation                      0x00007fff8ed9703c __exceptionPreprocess + 172
[14:23:04][Step 6/11]   1   libobjc.A.dylib                     0x00007fff93ea376e objc_exception_throw + 43
[14:23:04][Step 6/11]   2   CoreFoundation                      0x00007fff8ed96eed +[NSException raise:format:] + 205
[14:23:04][Step 6/11]   3   Foundation                          0x00007fff9607ac2b -[NSString substringToIndex:] + 118
[14:23:04][Step 6/11]   4   teamcity                            0x0000000102845b18 -[TeamCityReporter condensedBuildCommandOutput:] + 42
[14:23:04][Step 6/11]   5   teamcity                            0x0000000102845d1c -[TeamCityReporter endBuildCommand:] + 149
[14:23:04][Step 6/11]   6   teamcity                            0x000000010284535d -[Reporter handleEvent:] + 805
[14:23:04][Step 6/11]   7   teamcity                            0x0000000102844f35 __38+[Reporter readFromInput:andOutputTo:]_block_invoke + 259
[14:23:04][Step 6/11]   8   teamcity                            0x000000010284542d __ReadFileDescriptorAndOutputLinesToBlock_block_invoke + 61
[14:23:04][Step 6/11]   9   teamcity                            0x0000000102844d3b +[Reporter readFromInput:andOutputTo:] + 587
[14:23:04][Step 6/11]   10  teamcity                            0x0000000102845926 main + 89
[14:23:04][Step 6/11]   11  teamcity                            0x0000000102844ae4 start + 52
[14:23:04][Step 6/11]   12  ???                                 0x0000000000000001 0x0 + 1```

[ExtremeMan]

PR merged. Thanks for fixing!