Fixed privacy plugin crashing on non-existent file

Author: squidfunk

material/plugins/privacy/plugin.py

@@ -200,9 +200,11 @@ def on_post_build(self, *, config):
                     self._patch, file
                 ))
 
-            # Otherwise just copy external asset to output directory
+            # Otherwise just copy external asset to output directory if it
+            # exists, i.e., if the download succeeded
             else:
-                file.copy_file()
+                if os.path.exists(file.abs_src_path):
+                    file.copy_file()
 
         # Reconcile concurrent jobs for the last time, so the plugins following
         # in the build process always have a consistent state to work with

src/plugins/privacy/plugin.py

@@ -200,9 +200,11 @@ def on_post_build(self, *, config):
                     self._patch, file
                 ))
 
-            # Otherwise just copy external asset to output directory
+            # Otherwise just copy external asset to output directory if it
+            # exists, i.e., if the download succeeded
             else:
-                file.copy_file()
+                if os.path.exists(file.abs_src_path):
+                    file.copy_file()
 
         # Reconcile concurrent jobs for the last time, so the plugins following
         # in the build process always have a consistent state to work with