testcase added to fix for bug #12281 (Geometry & trigger crash)

mysql-test/r/gis.result:
  test result fixed
mysql-test/t/gis.test:
  testcase added

mysql-test/r/gis.result

@@ -665,3 +665,8 @@ ERROR 22003: Cannot get geometry object from data you send to the GEOMETRY field
 insert into t1 values (pointfromtext('point(1,1)'));
 ERROR 22003: Cannot get geometry object from data you send to the GEOMETRY field
 drop table t1;
+create table t1 (s1 geometry not null,s2 char(100));
+create trigger t1_bu before update on t1 for each row set new.s1 = null;
+insert into t1 values (null,null);
+ERROR 23000: Column 's1' cannot be null
+drop table t1;

mysql-test/t/gis.test

@@ -373,3 +373,13 @@ insert into t1 values (pointfromtext('point(1,1)'));
 drop table t1;
 
 # End of 4.1 tests
+
+#
+# Bug #12281 (Geometry: crash in trigger)
+#
+
+create table t1 (s1 geometry not null,s2 char(100));
+create trigger t1_bu before update on t1 for each row set new.s1 = null;
+--error 1048
+insert into t1 values (null,null);
+drop table t1;