Fix no output from errors

src/model/system.js

@@ -29,14 +29,14 @@ class System {
       core.info(result);
     }
 
-    if (exitCode !== 0) {
-      throw new Error(error);
-    }
-
     if (error !== '') {
       core.warning(error);
     }
 
+    if (exitCode !== 0) {
+      throw new Error(error);
+    }
+
     return result;
   }
 }