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

@@ -30,12 +30,13 @@ class AIXNetwork(GenericBsdIfconfigNetwork):
     platform = 'AIX'
 
     def get_default_interfaces(self, route_path):
+        interface = dict(v4={}, v6={})
+
         netstat_path = self.module.get_bin_path('netstat')
 
+        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()