fix: Handle non-existent files in apply_edits

aider/coders/base_coder.py

@@ -1658,4 +1658,14 @@ class Coder:
         return []
 
     def apply_edits(self, edits):
+        for edit in edits:
+            path, content = edit
+            full_path = self.abs_root_path(path)
+            if not os.path.exists(full_path):
+                self.io.tool_error(f"Error: File {path} does not exist. Skipping edits.")
+                continue
+            
+            if not self.dry_run:
+                with open(full_path, 'w', encoding=self.io.encoding) as f:
+                    f.write(content)
         return