Skip projections which raise errors

Instead of stopping the whole filtering process on erroneous projection, skip it, giving a clean warning.

Possible causes of a fatal error for a projection, are:

1. sampling: It's possible to have pathological projections for which MEBS cannot find ellipsoids.
2. integration: the projected ODEs raise numerical integration errors (CVODE Error: CV_ERR_FAILURE for the default IQMTools solver).