[nongnu] elpa/helm 3f2f695e79 2/5: Prevent possible error setting-constant (nil)

[ELPA Syncer]

branch: elpa/helm
commit 3f2f695e79bcbb9de336d2e97f236b39eb6c3046
Author: Thierry Volpiatto <thievol@posteo.net>
Commit: Thierry Volpiatto <thievol@posteo.net>

    Prevent possible error setting-constant (nil)
---
 helm-core.el | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/helm-core.el b/helm-core.el
index 76aef3c67a..964fa17f53 100644
--- a/helm-core.el
+++ b/helm-core.el
@@ -4361,12 +4361,13 @@ Cache the candidates if there is no cached value yet."
        (let ((real (if (consp ,candidate)
                        (cdr ,candidate)
                      ,candidate)))
-         (if (and (listp it)
-                  (not (functionp it))) ;; Don't treat lambda's as list.
-             (cl-loop for f in it
-                      do (setq ,candidate (funcall f real))
-                      finally return ,candidate)
-           (setq ,candidate (funcall it real))))
+         (when real
+           (if (and (listp it)
+                    (not (functionp it))) ;; Don't treat lambda's as list.
+               (cl-loop for f in it
+                        do (setq ,candidate (funcall f real))
+                        finally return ,candidate)
+             (setq ,candidate (funcall it real)))))
      ,candidate))
 
 (defun helm--initialize-one-by-one-candidates (candidates source)