Better exception usage -- BadQuery w/Errnum patch part 2

[Jim Wallace]

Part 2 of broken up new version of BadQuery update patches after review
by Warren.  

Again, per Warren, the BadQuery was misused in this case.

See http://lists.mysql.com/plusplus/7060 for reference

Diffs are from the current svn

Index: row.cpp
===================================================================
--- row.cpp	(revision 1779)
+++ row.cpp	(working copy)
@@ -54,7 +54,7 @@
 		initialized_ = true;
 	}
 	else if (throw_exceptions) {
-		throw BadQuery("ROW or RES is NULL");
+		throw ObjectNotInitialized("ROW or RES is NULL");
 	}
 }