Fix error panel padding always present on load

Author: vaner-org

editor/animation/animation_blend_space_1d_editor.cpp

@@ -801,6 +801,7 @@ AnimationNodeBlendSpace1DEditor::AnimationNodeBlendSpace1DEditor() {
 	error_label = memnew(Label);
 	error_label->set_focus_mode(FOCUS_ACCESSIBILITY);
 	error_panel->add_child(error_label);
+	error_panel->hide();
 
 	menu = memnew(PopupMenu);
 	add_child(menu);

editor/animation/animation_blend_space_2d_editor.cpp

@@ -1082,6 +1082,7 @@ AnimationNodeBlendSpace2DEditor::AnimationNodeBlendSpace2DEditor() {
 	error_label = memnew(Label);
 	error_label->set_focus_mode(FOCUS_ACCESSIBILITY);
 	error_panel->add_child(error_label);
+	error_panel->hide();
 
 	set_custom_minimum_size(Size2(0, 300 * EDSCALE));