makeCoaddTempExp.py with doApplyUberCal=True to use meas_mosaic outputs fail to build warps despite the input data exist. A small example to reproduce on lsst-dev is:
This doesn't really "fail" (and no logs in ERROR or FATAL level) but instead gives many confusing/misleading warnings and produce no outputs:
The log is misleading; this is DM-16537 about the generic exceptions. I troubleshoot a bit and trace to this line
where a non-empty header is obtained but no photoCalib is returned (that photCalib is None there). Feels like a bug in afw or meas_mosaic files; I paused there to file this ticket. Besides the bug, it'd be nice if the None calib is caught earlier.