Fix error with images info where no images (#233)

plugins/modules/podman_image_info.py

@@ -197,10 +197,12 @@ def get_image_info(module, executable, name):
 def get_all_image_info(module, executable):
     command = [executable, 'image', 'ls', '-q']
     rc, out, err = module.run_command(command)
-    name = out.strip().split('\n')
-    out = get_image_info(module, executable, name)
-
-    return out
+    out = out.strip()
+    if out:
+        name = out.split('\n')
+        res = get_image_info(module, executable, name)
+        return res
+    return json.dumps([])
 
 
 def main():

tests/integration/targets/podman_image_info/tasks/main.yml

@@ -1,5 +1,15 @@
 - name: Test podman_image_info
   block:
+
+    - name: Get info on images when no images
+      containers.podman.podman_image_info:
+      register: info_0
+
+    - name: Check results for no images
+      assert:
+        that:
+          - info_0.images | length == 0
+
     - name: Pull image
       command: podman pull quay.io/coreos/etcd
 
@@ -15,7 +25,7 @@
         name: dnsmasq
       register: named_image_result
 
-    - name:
+    - name: Check results
       assert:
         that:
           - all_image_result.images | length > 0