Remove is_empty database method

The existing get_total method can be used instead.

gramps/cli/grampscli.py

@@ -316,7 +316,7 @@ class CLIManager:
         # database is empty, then copy default researcher to DB owner
         if (res.is_empty()
                 and not owner.is_empty()
-                and self.dbstate.db.is_empty()):
+                and self.dbstate.db.get_total() == 0):
             self.dbstate.db.set_researcher(owner)
 
         name_displayer.set_name_format(self.dbstate.db.name_formats)

gramps/gen/db/generic.py

@@ -721,15 +721,6 @@ class DbGeneric(DbWriteBase, DbReadBase, UpdateCallback, Callback):
     def is_open(self):
         return self.db_is_open
 
-    def is_empty(self):
-        """
-        Return true if there are no [primary] records in the database
-        """
-        for table in self.get_table_func():
-            if len(self.get_table_func(table, "handles_func")()) > 0:
-                return False
-        return True
-
     def get_dbid(self):
         """
         We use the file directory name as the unique ID for

gramps/plugins/lib/libgedcom.py

@@ -1757,7 +1757,7 @@ class GedcomParser(UpdateCallback):
         self.number_of_errors = 0
         self.maxpeople = stage_one.get_person_count()
         self.dbase = dbase
-        self.import_researcher = self.dbase.is_empty()
+        self.import_researcher = self.dbase.get_total() == 0
         self.emapper = IdFinder(dbase.get_gramps_ids(EVENT_KEY),
                                 dbase.event_prefix)
         self.famc_map = stage_one.get_famc_map()