[meld: 2/4] Better error message when an action is attempted with no chunk

[Kai Willadsen <kaiw src gnome org>]

commit d3feba537d0bcb818e4a0c33589dac52e85e1906
Author: Anatoli Babenia <anatoli rainforce org>
Date:   Sat Aug 8 07:10:09 2020 +0300

    Better error message when an action is attempted with no chunk

 meld/filediff.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/meld/filediff.py b/meld/filediff.py
index 0a6a73ab..55c19f45 100644
--- a/meld/filediff.py
+++ b/meld/filediff.py
@@ -822,8 +822,8 @@ class FileDiff(Gtk.VBox, MeldDoc):
         valid_panes = list(range(0, self.num_panes))
         if src not in valid_panes or dst not in valid_panes:
             raise ValueError("Action was taken on invalid panes")
-        if self.num_panes > 2 and self.cursor.chunk is None:
-            raise ValueError("Action chunk taken from passive pane")
+        if self.cursor.chunk is None:
+            raise ValueError("Action was taken without chunk")
 
         chunk = self.linediffer.get_chunk(self.cursor.chunk, src, dst)
         if chunk is None: