Display 'Label required' for more time

[lontivero]

Close #1480

[lontivero]

@molnard could you take a look at the CI, please? It fails because the mutex is not released I think. That has nothing to do with this PR because the change that I did is trivial.

Starting test execution, please wait...
2019-05-29 20:39:38 ERROR AsyncMutex: InvalidOperationException: Previous AsyncLock state was unexpected: prev:StatusReleasing now:StatusAcquiring. in file-5BD1C5B
2019-05-29 20:39:38 ERROR AsyncMutex: InvalidOperationException: Thread should not be alive. in file-5BD1C5B
2019-05-29 20:39:38 WARNING AsyncMutex: System.InvalidOperationException: Previous AsyncLock state was unexpected: prev:StatusAcquiring now:StatusReady.
   at Nito.AsyncEx.AsyncMutex.ChangeStatus(AsyncLockStatus newStatus, AsyncLockStatus[] expectedPreviousStatuses) in /home/vsts/work/1/s/WalletWasabi/Nito/AsyncEx/AsyncMutex.cs:line 261
   at Nito.AsyncEx.AsyncMutex.ChangeStatus(AsyncLockStatus newStatus, AsyncLockStatus expectedPreviousStatus) in /home/vsts/work/1/s/WalletWasabi/Nito/AsyncEx/AsyncMutex.cs:line 250
   at Nito.AsyncEx.AsyncMutex.ReleaseLock() in /home/vsts/work/1/s/WalletWasabi/Nito/AsyncEx/AsyncMutex.cs:line 388
   at Nito.AsyncEx.AsyncMutex.Key.Dispose(Boolean disposing) in /home/vsts/work/1/s/WalletWasabi/Nito/AsyncEx/AsyncMutex.cs:line 451

[molnard]

Strange. Could you merge the master and try it again?

[lontivero]

Now it fails in Linux because it doesn't find a path (?)

[nopara73]

The issue experienced is unrelated to this PR though so I merge it.