CarrotTab isAvailable fails with non-numeric buildId

[ben-biddington]

@see: http://youtrack.jetbrains.net/issue/TW-11465?query=in+use

[ben-biddington]

This happens when you use one of the "permalinks" at the bottom of any build screen. Other links include "Last successful build" and "Last finished build".

These links look like:

/viewLog.html?buildTypeId=bt5&buildId=lastPinned

rather than:

/viewLog.html?buildId=99&tab=buildResultsDiv&buildTypeId=bt5

Under these alias conditions there is a cached copy of the build at:

request.getAttribute("BUILD_KEY")

which needs to be used rather than:

buildServer.findBuildInstanceById(Long)

[ben-biddington]

This has been fixed in 3804454