Handle case when version given is an empty string in uv_python module

tests/integration/targets/uv_python/tasks/main.yaml

@@ -257,10 +257,25 @@
 - name: No specified version
   uv_python:
     state: latest
+    version: ""
   ignore_errors: true
   register: no_version
 
 - name: Verify failure when no version is specified
   assert:
     that:
-      - no_version.failed is true
+      - no_version.failed is true
+      - '"Unsupported version format" in no_version.msg'
+
+- name: Unsupported version format given
+  uv_python:
+    state: latest
+    version: "3.8.post2"
+  ignore_errors: true
+  register: wrong_version
+
+- name: Verify failure when unsupported version format is specified
+  assert:
+    that:
+      - wrong_version.failed is true
+      - '"Unsupported version format" in wrong_version.msg'