Fix setup on Solaris 8 and 9 (#20780)

Neither the `virtinfo` nor `smbios` commands exist on these systems, which was causing `setup` to fail with the error `Argument 'args' to run_command must be list or string`.

lib/ansible/module_utils/facts.py

@@ -3342,6 +3342,7 @@ class SunOSVirtual(Virtual):
 
         else:
             smbios = self.module.get_bin_path('smbios')
+            if smbios:
                 rc, out, err = self.module.run_command(smbios)
                 if rc == 0:
                     for line in out.split('\n'):