solving null pointer exception for cross-schema FK dump, with not all schema's mentioned
updated on different comments
add comparison file testCrossSchemaFK
merge SytzeH: Fix NullPointException when dumping cross-schema FK and not all schemas specified

Merge pull request #88 from SytzeH/sql-layer-client-tools/errMes
https://github.com/FoundationDB/sql-layer-client-tools/pull/88