fix: handle default values of detectors and detector_ids in edd.Setup…

…NXdataReader and edd.UpdateNXdataReader

CHAP/edd/reader.py

@@ -518,6 +518,8 @@ def read(self, filename, dataset_id, detectors=None):
         :rtype: dict
         """
         from CHAP.common.models.map import DetectorConfig
+        if detectors is None:
+            detectors = []
         detector_config = DetectorConfig(detectors=detectors)
         # Columns in input .txt file:
         # 0: scan number
@@ -783,6 +785,8 @@ def read(self, spec_file, scan_number, detector_ids=None, inputdir='.'):
             f'dataset_point_index_offset = {dataset_point_index_offset}')
 
         # Get full data point for every point in the scan
+        if detector_ids is None:
+            detector_ids = []
         detector_data = scanparser.get_detector_data(detector_ids)
         detector_data = {_id: detector_data[:,i,:]
                          for i, _id in enumerate(detector_ids)}