SSB-44: add checking if the file exists

CAL/CalibrationCommon/lib/datacontainers/holography_dataset.py

@@ -537,6 +537,10 @@ class HolographyDataset():
         :return: the read dataset
         """
         f = None
+
+        if not os.path.exists(path):
+            raise FileNotFoundError(path)
+
         try:
             f = h5py.File(path, "r")