Print the exception when using `raises`
Print the exception when using `raises`

If the `raises` context manager gets an unexpected exception,
also print the exception string so the user can see what the
actual error is.

jdreaver/vispy,michaelaye/vispy,michaelaye/vispy,dchilds7/Deysha-Star-Formation,QuLogic/vispy,kkuunnddaannkk/vispy,drufat/vispy,ghisvail/vispy,RebeccaWPerry/vispy,inclement/vispy,RebeccaWPerry/vispy,Eric89GXL/vispy,jay3sh/vispy,srinathv/vispy,inclement/vispy,sbtlaarzc/vispy,bollu/vispy,michaelaye/vispy,julienr/vispy,sbtlaarzc/vispy,dchilds7/Deysha-Star-Formation,jdreaver/vispy,Eric89GXL/vispy,bollu/vispy,ghisvail/vispy,srinathv/vispy,jdreaver/vispy,drufat/vispy,julienr/vispy,RebeccaWPerry/vispy,Eric89GXL/vispy,bollu/vispy,QuLogic/vispy,kkuunnddaannkk/vispy,drufat/vispy,srinathv/vispy,julienr/vispy,QuLogic/vispy,jay3sh/vispy,jay3sh/vispy,inclement/vispy,kkuunnddaannkk/vispy,dchilds7/Deysha-Star-Formation,sbtlaarzc/vispy,ghisvail/vispy