RTPathOCL hangs when kernel compilation fails

[Theverat]

When the exception in the following line is thrown, RTPathOCL hangs (freezes), including Blender (user has to kill Blender manually). https://github.com/LuxCoreRender/LuxCore/blob/95d85566d9adc87fa4ea367cd7530f0a25e64d1d/src/slg/engines/pathoclbase/pathoclbaseoclthreadkernels.cpp#L840 I suspect it might be caused by missing exception handling + mutex in this line: https://github.com/LuxCoreRender/LuxCore/blob/95d85566d9adc87fa4ea367cd7530f0a25e64d1d/src/slg/engines/rtpathocl/rtpathoclthread.cpp#L252

PathOCL engine works as expected.

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