[dbapi] fix connect backwards compat harder
Passing None as group and host should result in
"pyro:///cubicweb.appid", not "pyro://None/None.appid". Followup for
2091d275fe5c. Closes #2882666.
/* -*- sql -*- mysql specific registered procedures, *//* XXX limit_size version dealing with format as postgres version does. XXX mysql doesn't support overloading, each function should have a different name NOTE: fulltext renamed since it cause a mysql name conflict */CREATEFUNCTIONtext_limit_size(vfulltextTEXT,maxsizeINT)RETURNSTEXTNOSQLBEGINIFLENGTH(vfulltext)<maxsizeTHENRETURNvfulltext;ELSERETURNSUBSTRING(vfulltextfrom1formaxsize)||'...';ENDIF;END;;