[UWMOODLE-634] Fixing empty course ids for getinorsql function so that if...

[UWMOODLE-634] Fixing empty course ids for getinorsql function so that if there are no local cowrses the block will still load.  

locallib.php

@@ -154,11 +154,13 @@ function block_course_overview_uwmoodle_group_courses_by_term($courses) {
                 }
             }
         }
-        list ($insql, $inparams) = $DB->get_in_or_equal($courseids);
-        $select = "enrol='wisc' AND courseid $insql";
-        $enrols = $DB->get_records_select('enrol', $select, $inparams, '', 'id,courseid,customchar1');
-        foreach ($enrols as $enrol) {
-            $courseterms[$enrol->courseid][$enrol->customchar1] = true;
+        if(!empty($courseids)){
+            list ($insql, $inparams) = $DB->get_in_or_equal($courseids);
+            $select = "enrol='wisc' AND courseid $insql";
+            $enrols = $DB->get_records_select('enrol', $select, $inparams, '', 'id,courseid,customchar1');
+            foreach ($enrols as $enrol) {
+                $courseterms[$enrol->courseid][$enrol->customchar1] = true;
+            }
         }
     }