[Fix #2964] Have cider-complete fail gracefully without a connection (#2977)

Author: brool

CHANGELOG.md

@@ -10,6 +10,7 @@
 
 * [#2941](https://github.com/clojure-emacs/cider/issues/2941): Use main args in alias for clojure cli
 * [#2953](https://github.com/clojure-emacs/cider/issues/2953): Don't font-lock function/macro vars as vars.
+* [#2964](https://github.com/clojure-emacs/cider/issues/2964): Fixes issue with `cider-company-enable-fuzzy-completion` and Helm
 
 ### Changes
 

cider-completion.el

@@ -162,7 +162,9 @@ we check if cider-nrepl's complete op is available
 and afterward we fallback on nREPL's built-in
 completion functionality."
   (cond
-   ;; First we try if cider-nrepl's completion is available
+   ;; if we don't have a connection, end early
+   ((not (cider-connected-p)) nil)
+   ;; next we try if cider-nrepl's completion is available
    ((cider-nrepl-op-supported-p "complete")
     (let* ((context (cider-completion-get-context))
            (candidates (cider-sync-request:complete prefix context)))