getQueuedBuilds(): Don't catch errors while loading a build from the queue

Otherwise we never recover from reset daemon connections, e.g.

hydra-queue-runner[16106]: while loading build 599369: cannot start daemon worker: reading from file: Connection reset by peer hydra-queue-runner[16106]: while loading build 599236: writing to file: Broken pipe …

The error is now handled queueMonitor(), causing the next call to queueMonitorLoop() to create a new connection.

Created by  Eelco Dolstra  on June 26, 2015
2AZSF326LF44FIXRMC3QU3D2TA3ZCNNAJYI23226GLMKVEGOPFUQC
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