Verifying that there exists multidata for the found starting line

before trying to use this multidata -- when a file is inserted, all
its lines will not have any multidata associated with them.


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5266 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

+2015-06-23  Benno Schulenberg  <bensberg@justemail.net>
+	* src/winio.c (edit_draw): Verify that there exists multidata for the
+	found starting line before trying to use it.  When a file is inserted
+	(^R), it will not have any precalculated multidata associated with it.
+	This fixes Savannah bug #45377 reported by Cody A. Taylor.
+
 2015-06-20  Benno Schulenberg  <bensberg@justemail.net>
 	* src/search.c (do_research): If nothing was searched for yet during
 	this run of nano, take the most recent item from the search history.

src/winio.c

@@ -2602,7 +2602,7 @@ void edit_draw(filestruct *fileptr, const char *converted, int
 
 		/* If the found start has been qualified as an end earlier,
 		 * believe it and skip to the next step. */
-		if (start_line != NULL &&
+		if (start_line != NULL && start_line->multidata != NULL &&
 			start_line->multidata[tmpcolor->id] == CBEGINBEFORE)
 		    goto step_two;