(conan-io#14911) yamllinter: raise if a version has patches but no so…

…urces

* yamllinter: raise if a version has patches but no sources

* Update conandata_yaml_linter.py

* we dont want to make noise se from errors just yet

---------

Co-authored-by: Chris Mc <prince.chrismc@gmail.com>

linter/conandata_yaml_linter.py

@@ -62,6 +62,14 @@ def main():
     if "patches" in parsed:
         for version in parsed["patches"]:
             patches = parsed["patches"][version]
+            if version not in parsed["sources"]:
+                print(
+                    f"::warning file={args.path},line={patches.start_line},endline={patches.end_line},"
+                    f"title=conandata.yml inconsistency"
+                    f"::Patch(es) are listed for version `{version}`, but there is source for this version."
+                    f" You should either remove `{version}` from the `patches` section, or add it to the"
+                    f" `sources` section"
+                )
             for i, patch in enumerate(patches):
                 # Individual report errors for each patch object
                 try: