Fill in missing original airdates for programs without programids.

Extend d4f6995 to also handle programs without programids.  Note,
this does not allow setting the original airdate for a program with a
programid from a program without a programid and vice versa.  I don't
want to handle that case unless and until I can see some real world
cases of needing it.

Fixes #10747 .  Bradley Baetz, if this still doesn't meet your needs,
please rework your patch along the lines of what is already done here.
I will not accept any patch which mixes this fixup with others like
your current one does with the first/last showing fixup.

mythtv/programs/mythfilldatabase/main.cpp

@@ -636,7 +636,28 @@ int main(int argc, char *argv[])
 
         if (query.exec())
             LOG(VB_GENERAL, LOG_INFO,
-                QString("    Found %1").arg(query.numRowsAffected()));
+                QString("    Found %1 with programids")
+                .arg(query.numRowsAffected()));
+
+        query.prepare("UPDATE program p "
+                      "JOIN ( "
+                      "  SELECT title, subtitle, description, "
+                      "         MAX(originalairdate) maxoad "
+                      "  FROM program "
+                      "  WHERE programid = '' AND "
+                      "        originalairdate IS NOT NULL "
+                      "  GROUP BY title, subtitle, description ) oad "
+                      "  ON p.programid = '' AND "
+                      "     p.title = oad.title AND "
+                      "     p.subtitle = oad.subtitle AND "
+                      "     p.description = oad.description "
+                      "SET p.originalairdate = oad.maxoad "
+                      "WHERE p.originalairdate IS NULL");
+
+        if (query.exec())
+            LOG(VB_GENERAL, LOG_INFO,
+                QString("    Found %1 without programids")
+                .arg(query.numRowsAffected()));
     }
 
     if (mark_repeats)