Don't raise an error when no symbol is found at a point

dumb-jump.el

@@ -3006,11 +3006,13 @@ Using ag to search only the files found via git-grep literal symbol search."
                  "2020-06-26")
 
   (cl-defmethod xref-backend-identifier-at-point ((_backend (eql dumb-jump)))
-    (let ((start (dumb-jump--get-symbol-start)))
-      (and start (let* ((ident (dumb-jump-get-point-symbol))
-                        (line (dumb-jump-get-point-line))
-                        (ctx (dumb-jump-get-point-context line ident start)))
-                   (propertize ident :dumb-jump-ctx ctx)))))
+    (let ((bounds (bounds-of-thing-at-point 'symbol)))
+      (and bounds (let* ((ident (dumb-jump-get-point-symbol))
+			             (start (car bounds))
+			             (col (- start (point-at-bol)))
+			             (line (dumb-jump-get-point-line))
+			             (ctx (dumb-jump-get-point-context line ident col)))
+		            (propertize ident :dumb-jump-ctx ctx)))))
 
   (cl-defmethod xref-backend-definitions ((_backend (eql dumb-jump)) prompt)
     (let* ((info (dumb-jump-get-results prompt))
@@ -3061,7 +3063,10 @@ Using ag to search only the files found via git-grep literal symbol search."
                          match-cur-file-front))))))
 
   (cl-defmethod xref-backend-apropos ((_backend (eql dumb-jump)) pattern)
-    (xref-backend-definitions 'dumb-jump pattern)))
+    (xref-backend-definitions 'dumb-jump pattern))
+
+  (cl-defmethod xref-backend-identifier-completion-table ((_backend (eql dumb-jump)))
+    nil))
 
 ;;;###autoload
 (defun dumb-jump-xref-activate ()