Only yield PackageData from a pom if we can parse it

    * Update CHANGELOG.rst

Signed-off-by: Jono Yang <jyang@nexb.com>

Author: JonoYang

CHANGELOG.rst

@@ -54,6 +54,15 @@ License detection:
   detected license only once. This data can contain the reference license text
   as an option.
 
+Package parsing:
+~~~~~~~~~~~~~~~~~
+
+- Code for parsing a Maven POM, npm package.json, freebsd manifest, haxelib
+  JSON, have been separated into two functions: one that creates a PackageData
+  object from the parsed Resource, and another that calls the previous function
+  and yields the PackageData. This was done such that we can use the package
+  manifest data parsing code outside of the scancode-toolkit context.
+
 v31.2.1 - 2022-10-05
 ----------------------------------
 

src/packagedcode/maven.py

@@ -1105,13 +1105,15 @@ def parse(
     Yield Packagedata objects from parsing a Maven pom file at `location` or
     using the provided `text` (one or the other but not both).
     """
-    yield _parse(
+    package = _parse(
         datasource_id=datasource_id,
         package_type=package_type,
         primary_language=primary_language,
         location=location,
         base_url=base_url
     )
+    if package:
+        yield package
 
 
 def _parse(