remove import error handling

src/textual/app.py

@@ -457,11 +457,11 @@ class App(Generic[ReturnType], DOMNode):
         Args:
             verbosity (int, optional): Verbosity level 0-3. Defaults to 1.
         """
-
-        devtools = self.devtools
-        if devtools is None:
+        
+        if not self.devtools_enabled:
             return
 
+        devtools = self.devtools
         if verbosity.value > LogVerbosity.NORMAL.value and not devtools.verbose:
             return
 

src/textual/devtools/server.py

@@ -1,17 +1,11 @@
 from __future__ import annotations
 
 import asyncio
-
-try:
-    from aiohttp.web import run_app
-    from aiohttp.web_app import Application
-    from aiohttp.web_request import Request
-    from aiohttp.web_routedef import get
-    from aiohttp.web_ws import WebSocketResponse
-except ImportError:
-    raise ImportError(
-        "Textual Devtools requires installation of the 'dev' extra dependencies."
-    )
+from aiohttp.web import run_app
+from aiohttp.web_app import Application
+from aiohttp.web_request import Request
+from aiohttp.web_routedef import get
+from aiohttp.web_ws import WebSocketResponse
 
 from textual.devtools.client import DEVTOOLS_PORT
 from textual.devtools.service import DevtoolsService