Removed false exception catching.

framework/yii/db/pgsql/Schema.php

@@ -158,11 +158,7 @@ where
 	and ns.nspname={$tableSchema}
 SQL;
 
-		try {
-			$constraints = $this->db->createCommand($sql)->queryAll();
-		} catch (\Exception $e) {
-			return false;
-		}
+		$constraints = $this->db->createCommand($sql)->queryAll();
 		foreach ($constraints as $constraint) {
 			$columns = explode(',', $constraint['columns']);
 			$fcolumns = explode(',', $constraint['foreign_columns']);
@@ -172,7 +168,6 @@ SQL;
 			}
 			$table->foreignKeys[] = $citem;
 		}
-		return true;
 	}
 
 	/**