Fix CID992335,CID992334: Check FindRef/String returns

Satisfy Coverity by checking return values of FindRef and FindString
calls for fSavedMessage.

Resolves CID992335 and CID992334.
Fix CID991133: Same if expression was duplicated
Fix CID609944: Uninitialized scalar field

Default constructor for UTF8Char has not initialize it's data.
Fix CID991683: Uninitalized scalar field

fOldTitleUSerDefined was (surprice-surprice!) not defined.
Fix CID991252: Possible NULL dereference on scheme name

The color scheme name pointer is dereferenced but was not checked for
NULL value.