Remove empty regexes

src/calng/DetectorAssembler.py

@@ -29,11 +29,6 @@ from . import geom_utils, preview_utils, scenes, schemas, utils
 from ._version import version as deviceVersion
 
 
-corr_source_re = re.compile()
-xtdf_source_re = re.compile()
-daq_source_re = re.compile()
-
-
 class BridgeOutputOptions(enum.Enum):
     MATCHED = "matched"
     ASSEMBLED = "assembled"