ManifetPatrser fixes (#3080)

* Skip broken examples declaration

* Allow dots in keywords

* Allow "+" in keywords

platformio/package/manifest/model.py

@@ -56,7 +56,7 @@ class ManifestModel(DataModel):
     )
     description = DataField(max_length=1000, required=True)
     keywords = DataField(
-        type=ListOfType(DataField(max_length=255, regex=r"^[a-z\d\- ]+$")),
+        type=ListOfType(DataField(max_length=255, regex=r"^[a-z\d\-\+\. ]+$")),
         required=True,
     )
     authors = DataField(type=ListOfType(AuthorModel), required=True)

platformio/package/manifest/parser.py

@@ -149,7 +149,7 @@ class BaseManifestParser(object):
             or not isinstance(examples, list)
             or not all(isinstance(v, dict) for v in examples)
         ):
-            data["examples"] = None
+            examples = None
         if not examples and self.package_dir:
             data["examples"] = self.parse_examples_from_dir(self.package_dir)
         if "examples" in data and not data["examples"]: