add explicit debug messages if element is not available

Author: pvgenuchten

pycsw/core/metadata.py

@@ -1524,24 +1524,25 @@ def _parse_iso(context, repos, exml):
     if hasattr(md, 'dataquality'):
         try:
             _set(context, recobj, 'pycsw:Degree', ','.join(md.dataquality.conformancedegree))
-        except:
-            None
-        try:    
+        except IndexError:
+            LOGGER.debug('No dq conformancedegree')
+        try:
             _set(context, recobj, 'pycsw:Lineage', md.dataquality.lineage)
-        except:
-            None
+        except IndexError:
+            LOGGER.debug('No dq lineage')
         try:
             _set(context, recobj, 'pycsw:SpecificationTitle', md.dataquality.specificationtitle)
-            _set(context, recobj, 'pycsw:specificationDate', md.dataquality.specificationDate[0])
-            # owslib does not provide datetype
-            # _set(context, recobj, 'pycsw:SpecificationDateType', md.dataquality.specificationDate[0].datetype)
-        except:
-            None
+        except IndexError:
+            LOGGER.debug('No dq specification title')
+        try:
+            _set(context, recobj, 'pycsw:SpecificationDate', 
+                 next(iter(md.dataquality.specificationDate), None))
+        except IndexError:
+            LOGGER.debug('No dq specification date')
 
     if hasattr(md, 'contact') and len(md.contact) > 0:
         _set(context, recobj, 'pycsw:ResponsiblePartyRole', md.contact[0].role)
 
-
     if hasattr(md, 'contentinfo') and len(md.contentinfo) > 0:
         for ci in md.contentinfo:
             if isinstance(ci, MD_ImageDescription):