remove default for source: CliPositionalArg

Author: FynnBe

bioimageio/core/cli.py

@@ -121,7 +121,7 @@ def log(self, descr: Union[ResourceDescr, InvalidDescr]):
 
 
 class WithSource(ArgMixin):
-    source: CliPositionalArg[str] = "."
+    source: CliPositionalArg[str]
     """Url/path to a (folder with a) bioimageio.yaml/rdf.yaml file
     or a bioimage.io resource identifier, e.g. 'affable-shark'"""