Make text2wav work with the Finnish voices. (Closes: #495114)

This fixes a SIOD ERROR: wrong type of argument to get_c_val
when using text2wav or just speaking silence: (SayText "")

Apparently the item.name function can't be applied to a nil value.
--- festvox-suopuhe-lj-1.0g-20051204.orig/lib/voices/finnish/suo_fi_lj_diphone/festvox/finnish_mv_phrase.scm
+++ festvox-suopuhe-lj-1.0g-20051204/lib/voices/finnish/suo_fi_lj_diphone/festvox/finnish_mv_phrase.scm
@@ -351,7 +351,7 @@
   "(initial_doubling WORD)
 Checks wheter the current WORD can triggers initial doubling on the
 next word or not."
-  (let ((name (downcase (item.name WORD))))
+  (let ((name (if WORD (downcase (item.name WORD) nil))))
     (if (and (item.next WORD) 
 	     (not (word_has_break? WORD))
 	     ;; (not suopuhe) ;; suopuhe-mode deal this personally ???
