Skip internal scripts for breakpoints without printing an error

This removes:
```
ERROR: get_breakpoints: Condition ' base.begins_with("local://")
```
while running a project with blank scripts caused by deleting
or moving, or built-in scripts which are not yet saved within a scene
on running a project.

(cherry picked from commit 1c70a33d9c4a6641f63b067134a357b102640d66)

editor/plugins/script_editor_plugin.cpp

@@ -1559,7 +1559,9 @@ void ScriptEditor::get_breakpoints(List<String> *p_breakpoints) {
 		List<int> bpoints;
 		se->get_breakpoints(&bpoints);
 		String base = script->get_path();
-		ERR_CONTINUE(base.begins_with("local://") || base == "");
+		if (base.begins_with("local://") || base == "") {
+			continue;
+		}
 
 		for (List<int>::Element *E = bpoints.front(); E; E = E->next()) {