Fix a couple try/except pass cases

.bandit

 [bandit]
 skips: B506
-exclude: aossceilo/tests,aossceilo/nc.py
+exclude: aossceilo/tests,aossceilo/nc.py,aossceilo/message.py

aossceilo/level_b1/message.py

@@ -506,9 +506,8 @@ def hex_to_int(
 def _get(fcn, v, d):
     try:
         return fcn(v)
-    except:
-        pass
-    return d
+    except (ValueError, TypeError):
+        return d
 
 
 def _float(v):
@@ -592,8 +591,8 @@ def parse_backscatter(
             hval = line[idx : idx + 4]
             try:
                 backscatter[bidx] = hex_to_int(hval)
-            except:
-                pass
+            except (TypeError, ValueError):
+                _log.error("Invalid hex value", exc_info=True)
             bidx += 1
 
     return backscatter

aossceilo/level_b1/nc.py

@@ -4,9 +4,9 @@ import importlib.resources
 import os
 import sys
 from calendar import timegm
-from defusedxml.cElementTree import fromstring
 
 import numpy
+from defusedxml.cElementTree import fromstring
 from netCDF4 import Dataset
 
 from aossceilo.level_b1 import message