`lsp-lens--create-interactive-command': non-nil

The COMMAND? argument of that function mustn't be nil, which is unclear
from its name (?). Note that fact in its docstring.

The name of that argument is still good though, because it refers to a
field name in `CodeAction' and `CodeLens'.

Based on a discussion with @kiennq.

Author: nbfalcon

lsp-lens.el

@@ -144,7 +144,9 @@ BUFFER-MODIFIED? determines whether the buffer is modified or not."
     (define-key [mouse-1] (lsp-lens--create-interactive-command command))))
 
 (defun lsp-lens--create-interactive-command (command?)
-  "Create an interactive COMMAND? for the lens."
+  "Create an interactive COMMAND? for the lens.
+COMMAND? shall be an `&Command' (e.g. `&CodeLens' :command?) and
+mustn't be nil."
   (if (functionp (lsp:command-command command?))
       (lsp:command-command command?)
     (lambda ()