Fix running without --with-containers

Author: DomAyre

src/confcom/azext_confcom/_validators.py

@@ -39,7 +39,7 @@ def validate_aci_source(namespace):
         namespace.arm_template,
         namespace.image_name,
         namespace.virtual_node_yaml_path,
-        namespace.container_definitions != [],
+        namespace.container_definitions is not None,
     ])) != 1:
         raise CLIError("Can only generate CCE policy from one source at a time")
 
@@ -75,7 +75,7 @@ def validate_fragment_source(namespace):
     if not namespace.generate_import and sum(map(bool, [
         namespace.image_name,
         namespace.input_path,
-        namespace.container_definitions != [],
+        namespace.container_definitions is not None,
     ])) != 1:
         raise CLIError("Must provide either an image name or an input file to generate a fragment")