Index: /trunk/psModules/src/imcombine/pmSubtractionIO.c
===================================================================
--- /trunk/psModules/src/imcombine/pmSubtractionIO.c	(revision 27094)
+++ /trunk/psModules/src/imcombine/pmSubtractionIO.c	(revision 27095)
@@ -67,7 +67,7 @@
     }
     if (regions->n == 0) {
-        psError(PM_ERR_PROG, true, "No subtraction regions found.");
+        // We wrote everything we could find
         psFree(regions);
-        return false;
+        return true;
     }