generate: container: Remove Nones and log_error() on missing optional keys

Signed-off-by: Enno Tensing <tenno@suij.in>

generate/container.py

@@ -247,13 +247,13 @@ class Volume:
     path: str
 
     @classmethod
-    def from_json(cls, val: ConfigValue, logger: Log) -> list | None:
+    def from_json(cls, val: ConfigValue, logger: Log) -> list:
         """Create from JSON."""
         if val is None:
-            return None
+            return []
         if not isinstance(val, dict):
             logger.log_warning("Volume key is present, but malformed.")
-            return None
+            return []
         return [cls(key, value) for key, value in val.items()]
 
     def is_host_volume(self) -> bool:
@@ -302,13 +302,13 @@ class Secret:
     options: str
 
     @classmethod
-    def from_json(cls, val: ConfigValue, logger: Log) -> list | None:
+    def from_json(cls, val: ConfigValue, logger: Log) -> list:
         """Create from JSON."""
         if val is None:
-            return None
+            return []
         if not isinstance(val, dict):
             logger.log_warning("Secret key is present, but malformed!")
-            return None
+            return []
         secrets = []
         for key in val:
             if not isinstance(val[key], dict):
@@ -451,8 +451,11 @@ class Network:
     @classmethod
     def from_json(cls, val: ConfigValue, logger: Log) -> Self:
         """Create from JSON."""
-        if val is None or not isinstance(val, dict):
-            logger.log_error("Network configuration is missing or malformed!")
+        if val is None:
+            return cls("", [])
+
+        if not isinstance(val, dict):
+            logger.log_warning("Network configuration is malformed!")
             return cls("", [])
         mode = maybe(val, "mode")
         options = maybe(val, "options")
@@ -505,13 +508,15 @@ class Capability:
     mode: str
 
     @classmethod
-    def from_json(cls, val: ConfigValue, logger: Log) -> list | None:
+    def from_json(cls, val: ConfigValue, logger: Log) -> list:
         """Create from JSON."""
-        if val is None or not isinstance(val, dict):
+        if val is None:
+            return []
+        if not isinstance(val, dict):
             logger.log_warning(
-                "Capabilities key is either missing or malformed!"
+                "Capabilities key is malformed!"
             )
-            return None
+            return []
         add = [cls(value, "add") for value in val["add"]]
         drop = [cls(value, "drop") for value in val["drop"]]
         return add + drop
@@ -531,8 +536,11 @@ class Dns:
     @classmethod
     def from_json(cls, val: ConfigValue, logger: Log) -> Self:
         """Create from JSON."""
-        if val is None or not isinstance(val, dict):
-            logger.log_error("DNS Key is either missing or malformed!")
+        if val is None:
+            return cls([], "")
+
+        if not isinstance(val, dict):
+            logger.log_warning("DNS Key is malformed!")
             return cls([], "")
         search = maybe_or(val, "search", "")
         servers = maybe(val, "servers")
@@ -570,10 +578,10 @@ class Container:
     network: Network
     dns: Dns
     ports: Ports
-    env: Environment | None
-    secrets: list | None
-    volumes: list | None
-    capabilities: list | None
+    env: Environment
+    secrets: list
+    volumes: list
+    capabilities: list
     accounting: Accounting
 
     def __init__(self, json: dict, logger: Log | None = None) -> None: