Fix 'No LAYOUTs defined' check (#19537)

data/schemas/keyboard.jsonschema

@@ -257,6 +257,9 @@
                     "c_macro": {
                         "type": "boolean"
                     },
+                    "json_layout": {
+                        "type": "boolean"
+                    },
                     "layout": {
                         "type": "array",
                         "items": {

lib/python/qmk/info.py

@@ -52,7 +52,7 @@ def _validate(keyboard, info_data):
     community_layouts_names = list(map(lambda layout: f'LAYOUT_{layout}', community_layouts))
 
     # Make sure we have at least one layout
-    if len(layouts) == 0:
+    if len(layouts) == 0 or all(not layout.get('json_layout', False) for layout in layouts.values()):
         _log_error(info_data, 'No LAYOUTs defined! Need at least one layout defined in info.json.')
 
     # Providing only LAYOUT_all "because I define my layouts in a 3rd party tool"
@@ -107,6 +107,7 @@ def info_json(keyboard):
     for layout_name, layout_json in layouts.items():
         if not layout_name.startswith('LAYOUT_kc'):
             layout_json['c_macro'] = True
+            layout_json['json_layout'] = False
             info_data['layouts'][layout_name] = layout_json
 
     # Merge in the data from info.json, config.h, and rules.mk
@@ -824,6 +825,7 @@ def merge_info_jsons(keyboard, info_data):
                     msg = 'Number of keys for %s does not match! info.json specifies %d keys, C macro specifies %d'
                     _log_error(info_data, msg % (layout_name, len(layout['layout']), len(info_data['layouts'][layout_name]['layout'])))
                 else:
+                    info_data['layouts'][layout_name]['json_layout'] = True
                     for new_key, existing_key in zip(layout['layout'], info_data['layouts'][layout_name]['layout']):
                         existing_key.update(new_key)
             else:
@@ -831,6 +833,7 @@ def merge_info_jsons(keyboard, info_data):
                     _log_error(info_data, f'Layout "{layout_name}" has no "matrix" definition in either "info.json" or "<keyboard>.h"!')
                 else:
                     layout['c_macro'] = False
+                    layout['json_layout'] = True
                     info_data['layouts'][layout_name] = layout
 
         # Update info_data with the new data