For fonts that are missing `/FamilyName` entry in the `/FontInfo` dictionary, 
treat /FontName as family name.
Index: mkfontscale.c
===================================================================
--- mkfontscale.c.orig	2015-03-03 10:52:05.209865756 +0100
+++ mkfontscale.c	2015-03-03 11:10:29.389841158 +0100
@@ -583,6 +583,9 @@
             family = strdup(t1info->family_name);
         if(!family && t1info->full_name)
             family = strdup(t1info->full_name);
+        /* Hershey fonts miss /FamilyName */
+        if(!family && face->family_name)
+            family = strdup(face->family_name);
         if(!full_name && t1info->full_name)
             full_name = strdup(t1info->full_name);
         if(!foundry)