[BUGFIX] Missing check if $row[t3ver_state] is set in IconUtility

As a result of a missing check if $row['t3ver_state'] exists,
an exception is thrown when IconUtility::getIcon() is called
with only the required params set.

This patch adds the missing check.

Resolves: #58846
Releases: 6.2
Change-Id: I70da9ee79a5c0ee1ad4fe8892e8ed28f904a11da
Reviewed-on: https://review.typo3.org/30152
Reviewed-by: Fabien Udriot
Tested-by: Fabien Udriot
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel