template: handle render exceptions

Re-raise as either a ServerError or ConfigError as appropriate.

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>

moonraker/moonraker.py

@@ -57,6 +57,7 @@ SENTINEL = SentinelClass.get_instance()
 
 class Server:
     error = ServerError
+    config_error = confighelper.ConfigError
     def __init__(self,
                  args: Dict[str, Any],
                  log_manager: LogManager,
@@ -69,6 +70,7 @@ class Server:
         self.components: Dict[str, Any] = {}
         self.failed_components: List[str] = []
         self.warnings: Dict[str, str] = {}
+        self._is_configured: bool = False
 
         self.config = config = self._parse_config()
         self.host: str = config.get('host', "0.0.0.0")
@@ -124,6 +126,9 @@ class Server:
     def is_running(self) -> bool:
         return self.server_running
 
+    def is_configured(self) -> bool:
+        return self._is_configured
+
     def is_debug_enabled(self) -> bool:
         return self.debug
 
@@ -238,6 +243,7 @@ class Server:
 
         self.klippy_connection.configure(config)
         config.validate_config()
+        self._is_configured = True
 
     def load_component(self,
                        config: confighelper.ConfigHelper,
@@ -259,7 +265,7 @@ class Server:
             if component_name not in self.failed_components:
                 self.failed_components.append(component_name)
             if isinstance(default, SentinelClass):
-                raise ServerError(msg)
+                raise
             return default
         self.components[component_name] = component
         logging.info(f"Component ({component_name}) loaded")