StoredObjectRepresentationNotAvailableException: Add constructor that takes cause

StoredObjectRepresentationNotAvailableException: Add constructor that takes cause

If the cause can be passed into the constructor, callers don't need to
instantiate it and then explicitly call initCause.

Note that the constructors in this class cause "non-API parameter type"
warnings because ObjectToPack is internal, however it's probably OK
since the only non-internal reference to it is in the pgm.debug package.

Change-Id: Ia4eab24e79f9afe6214ea8160137d941d4048319
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>