fix: preserve empty names input or output file lists in params or res…

…ource functions
snakemake · Mar 2, 2022 · 0d19ab0 · 0d19ab0
1 parent 994b151
commit 0d19ab0
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Showing 2 changed files with 3 additions and 3 deletions.
diff --git a/snakemake/io.py b/snakemake/io.py
@@ -1416,7 +1416,7 @@ def __init__(
         for name in self._allowed_overrides:
             setattr(self, name, functools.partial(self._used_attribute, _name=name))
 
-        if toclone:
+        if toclone is not None:
             if custom_map is not None:
                 self.extend(map(custom_map, toclone))
             elif plainstr:
@@ -1427,7 +1427,7 @@ def __init__(
                 self.extend(toclone)
             if isinstance(toclone, Namedlist):
                 self._take_names(toclone._get_names())
-        if fromdict:
+        if fromdict is not None:
             for key, item in fromdict.items():
                 self.append(item)
                 self._add_name(key)

diff --git a/snakemake/rules.py b/snakemake/rules.py
@@ -825,7 +825,7 @@ def _apply_wildcards(
                         and not isinstance(item_, Path)
                     ):
                         raise WorkflowError(
-                            "Function did not return str or list " "of str.", rule=self
+                            "Function did not return str or list of str.", rule=self
                         )
 
                     if from_callable and apply_path_modifier and not incomplete: