Fix AIX networks facts when nestat is either missing or has incorrect permissions (#72516)

* Added check for none on netstat_path variable

* Added changelog

changelogs/fragments/72516-fix-aix-network-facts.yml

@@ -0,0 +1,2 @@
+bugfixes:
+    - Fixed issue when `netstat` is either missing or doesn't have execution permissions leading to incorrect command being executed. 

lib/ansible/module_utils/facts/network/aix.py

@@ -30,22 +30,23 @@ class AIXNetwork(GenericBsdIfconfigNetwork):
     platform = 'AIX'
 
     def get_default_interfaces(self, route_path):
+        interface = dict(v4={}, v6={})
+
         netstat_path = self.module.get_bin_path('netstat')
 
-        rc, out, err = self.module.run_command([netstat_path, '-nr'])
+        if netstat_path:
+            rc, out, err = self.module.run_command([netstat_path, '-nr'])
 
-        interface = dict(v4={}, v6={})
-
-        lines = out.splitlines()
-        for line in lines:
-            words = line.split()
-            if len(words) > 1 and words[0] == 'default':
-                if '.' in words[1]:
-                    interface['v4']['gateway'] = words[1]
-                    interface['v4']['interface'] = words[5]
-                elif ':' in words[1]:
-                    interface['v6']['gateway'] = words[1]
-                    interface['v6']['interface'] = words[5]
+            lines = out.splitlines()
+            for line in lines:
+                words = line.split()
+                if len(words) > 1 and words[0] == 'default':
+                    if '.' in words[1]:
+                        interface['v4']['gateway'] = words[1]
+                        interface['v4']['interface'] = words[5]
+                    elif ':' in words[1]:
+                        interface['v6']['gateway'] = words[1]
+                        interface['v6']['interface'] = words[5]
 
         return interface['v4'], interface['v6']