Remove dead code paths identified by vulture. (#221)

* Remove dead code path in Collection.

* Raise errors at the end of copytree.

signac/contrib/collection.py

@@ -213,11 +213,6 @@ def _build_index(docs, key, primary_key):
                     "Specifically keys with dots ('.').\n\n"
                     "See https://signac.io/document-wide-migration/ "
                     "for a recipe on how to replace dots in existing keys.")
-                # inlined for performance
-                if type(v) is list:     # performance
-                    index[_to_hashable(v)].add(doc[primary_key])
-                else:
-                    index[v].add(doc[primary_key])
     return index
 
 

signac/syncutil.py

@@ -38,12 +38,10 @@ def copytree(src, dst, copy_function=shutil.copy2, symlinks=False):
             else:
                 copy_function(srcname, dstname)
         except OSError as why:
-            raise
             errors.append((srcname, dstname, str(why)))
         # catch the Error from the recursive copytree so that we can
         # continue with other files
         except shutil.Error as err:
-            raise
             errors.extend(err.args[0])
     if errors:
         raise shutil.Error(errors)