Improved empty check for external reference values, resolves #51200


git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/external_import/trunk@79050 735d13b6-9817-0410-8766-e36946ffe9aa
Corrected various errors in the manual, resolves #50626


git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/external_import/trunk@79051 735d13b6-9817-0410-8766-e36946ffe9aa
Moved new empty check to correct place :-\, references #51200


git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/external_import/trunk@79052 735d13b6-9817-0410-8766-e36946ffe9aa