fix a few bugs with the liveview

generic/models.py

@@ -323,7 +323,7 @@ class SeriesImageBase(models.Model):
         try:
             with pydicom.dcmread(self.image) as d:
                 return d
-        except pydicom.errors.InvalidDicomError:
+        except (pydicom.errors.InvalidDicomError, FileNotFoundError, OSError):
             return {}
 
     def get_full_url(self):
@@ -335,14 +335,14 @@ class SeriesImageBase(models.Model):
     def get_dicom_json(self):
         try:
             json = pydicom.dcmread(self.image).to_json()
-        except pydicom.errors.InvalidDicomError:
+        except (pydicom.errors.InvalidDicomError, FileNotFoundError, OSError):
             return {}
         return json
 
     def get_dicom_info(self):
         try:
             info = pretty_print_dicom(pydicom.dcmread(self.image))
-        except pydicom.errors.InvalidDicomError:
+        except (pydicom.errors.InvalidDicomError, FileNotFoundError, OSError):
             info = "File is not a dicom."
         return info