Fixed the ultimate bug with embl (and genbank) parsers: raising any

exception in a python generator makes it unable to resume. So now,
exceptions are not raised but printed, then functions return None and
that's handled at higher level.

python/obitools3/commands/import.pyx

@@ -5,6 +5,7 @@ import os
 
 from obitools3.apps.progress cimport ProgressBar  # @UnresolvedImport
 from obitools3.dms.view.view cimport View
+from obitools3.dms.view import RollbackException
 from obitools3.dms.view.typed_view.view_NUC_SEQS cimport View_NUC_SEQS
 from obitools3.dms.column.column cimport Column
 from obitools3.dms.obiseq cimport Nuc_Seq
@@ -153,6 +154,13 @@ def run(config):
     i = 0
     for entry in entries :
         
+        if entry is None:  # error or exception handled at lower level, not raised because Python generators can't resume after any exception is raised
+            if config['obi']['skiperror']:
+                i-=1
+                continue
+            else:
+                raise RollbackException("obi import error, rollbacking view", view)
+        
         pb(i)
                         
         if NUC_SEQS_view: