Close IFormatReader copy if not to be used

The generated copy from Memoizer's loadReader logic
was in some cases not being used. When the null was
returned, a RandomAccessFile held by the reader was
left open.
Also close on java.lang.Error
Merge pull request #1196 from joshmoore/memo-close-copy

Close IFormatReader copy if not to be used
Update auto-generated documentation

Repository: openmicroscopy/bioformats
Already up-to-date.

Generated by BIOFORMATS-5.0-latest-docs-autogen#244 (http://ci.openmicroscopy.org/job/BIOFORMATS-5.0-latest-docs-autogen/244/)