Began removing the excessive use of exceptions in the 1D readers by drawing

Began removing the excessive use of exceptions in the 1D readers by drawing
a line in the sand: no one may throw an exception from decodeRow(). Next up
is to throw fewer exceptions internally.

git-svn-id: http://zxing.googlecode.com/svn/trunk@1527 59b500cc-1b3d-0410-9834-0bbf25fbcc57