bug fix mpi: handling of unloadable chunks/templates

mpi/scanned_days_manager.py

@@ -82,12 +82,14 @@ class ScannedDaysManager(object):
             self.__add_entry(self.to_process, chunk, template)
 
     def remove_chunk(self, chunk):
-        self.chunks.remove(chunk)
+        if chunk in self.chunks:
+            self.chunks.remove(chunk)
         if chunk in self.to_process:
             del self.to_process[chunk]
 
     def remove_template(self, template):
-        self.templates.remove(template)
+        if template in self.templates:
+            self.templates.remove(template)
         for chunk in self.to_process[:]:
             self.__remove_entry(self.to_process, chunk, template)