Fix "bind -M somemode" crash for empty bind modes

This loop iterates over all bindings and crashes if a mode filter
argument is given for a mode that has no binding.  Fix this by
continuing the loop earlier.

Fixes 11d6e92cb5 (Show file location when querying bindings with bind, 2025-12-28)

Fixes #12798

src/builtins/bind.rs

@@ -213,6 +213,9 @@ fn list(
         let mut cur_file = None;
 
         for binding in lst {
+            if bind_mode.is_some_and(|m| m != binding.mode) {
+                continue;
+            }
             let mut out = WString::new();
             let definition_file =
                 &self.input_mappings.get(&binding.seq, bind_mode, user)[0].definition_file;
@@ -233,9 +236,6 @@ fn list(
                     cur_file = Some(def_file);
                 }
             }
-            if bind_mode.is_some_and(|m| m != binding.mode) {
-                continue;
-            }
             self.list_one(&binding.seq, Some(&binding.mode), user, parser, streams);
         }
     }

tests/checks/bind.fish

@@ -3,6 +3,8 @@
 
 set -l fish (status fish-path)
 
+bind -M insert
+
 set -l tmpdir (mktemp -d)
 for bindings in true fish_default_key_bindings fish_vi_key_bindings
     $fish -c "