Index: mapping.c
===================================================================
--- mapping.c	(revision 2306)
+++ mapping.c	(working copy)
@@ -3352,7 +3352,7 @@
         /* If one of the two mappings is empty, we can adjust its width
          * after getting rid of all pending data blocks.
          */
-        if (0 == m2->num_entries && NULL == m2->hash)
+        if (0 == m2->num_entries)
         {
             if (m2->cond != NULL)
             {
@@ -3363,7 +3363,7 @@
             }
             m2->num_values = m1->num_values;
         }
-        else if (0 == m1->num_entries && NULL == m1->hash)
+        else if (0 == m1->num_entries)
         {
             if (m1->cond != NULL)
             {