Make API return error before raising error again (#606)

This change makes it so any API clients can show the same error as what
happens in the terminal where you run the API. Useful for various WebUIs
to display more helpful error messages to users.

Co-authored-by: CapableWeb <capableweb@domain.com>

ldm/dream/server.py

@@ -247,6 +247,15 @@ class DreamServer(BaseHTTPRequestHandler):
         except CanceledException:
             print(f"Canceled.")
             return
+        except Exception as e:
+            print("Error happened")
+            print(e)
+            self.wfile.write(bytes(json.dumps(
+                {'event': 'error',
+                 'message': str(e),
+                 'type': e.__class__.__name__}
+            ) + '\n',"utf-8"))
+            raise e
 
 
 class ThreadingDreamServer(ThreadingHTTPServer):