Catch errors while decoding the cms content. Fixes error while trying to parse a ghostbusters record as a roa.
Revert "GRE-269 The manifest CMS that we somehow fail to parse from our validator app, yet it looks fine from rpki-commons."

The validation error was triggered by a ghostbusters record on the manifest and not the manifest itself. Fixed in commit b35df5d09456af29fc728d50fe6fa2ced02784c9

This reverts commit 4df76cfefee30ca5577ce4d2974536989abda703.