[Fix #1050] Don't throw an error on non-git projects when trying to f…

…igure

out the ignored files

projectile.el

@@ -998,7 +998,8 @@ Files are returned as relative paths to the project root."
   (let ((vcs (projectile-project-vcs)))
     (cond
      ((eq vcs 'git) projectile-git-ignored-command)
-     (t (error "VCS command for ignored files not implemented yet")))))
+     ;; TODO: Add support for other VCS
+     (t nil))))
 
 (defun projectile-flatten (lst)
   "Take a nested list LST and return its contents as a single, flat list."
@@ -1071,7 +1072,8 @@ they are excluded from the results of this function."
 (defun projectile-get-repo-ignored-files ()
   "Get a list of the files ignored in the project."
   (let ((cmd (projectile-get-ext-ignored-command)))
-    (projectile-files-via-ext-command cmd)))
+    (when cmd
+      (projectile-files-via-ext-command cmd))))
 
 (defun projectile-files-via-ext-command (command)
   "Get a list of relative file names in the project root by executing COMMAND."