Pass through vestigial items where multiple codepoints have been conv…

…erted into a single glyph. Allows correct hyphenation of Indic scripts; fixes #308.

languages/unicode.lua

@@ -55,7 +55,7 @@ SILE.nodeMakers.unicode = SILE.nodeMakers.base {
       self:addToken(char,item)
       self:makeToken()
       self:makePenalty(0)
-    elseif lasttype and (thistype ~= lasttype and thistype ~= "cm") then
+    elseif lasttype and (thistype and thistype ~= lasttype and thistype ~= "cm") then
       self:makeToken()
       self:addToken(char,item)
     else

tests/bug-308.expected

@@ -0,0 +1,27 @@
+<tests/bug-308.sil>
+Set paper size 	595.275597	841.8897729
+Begin page
+Mx 	49.40787
+My 	156.15370
+Set font 	Noto Sans Malayalam;12;400;;normal;;LTR
+T	55 4	(സം)
+Mx 	69.51725
+T	55 59	(സാ)
+Mx 	90.24772
+T	47 60	(രി)
+Mx 	101.81412
+T	260	(-)
+Mx 	49.40787
+My 	170.55370
+T	159 60	(ച്ചി)
+Mx 	63.34147
+T	47 60	(രി)
+Mx 	74.90787
+T	147 62 20	(ക്കുക)
+[1] Mx 	278.32625
+My 	732.62998
+Set font 	Gentium;10;400;;normal;;LTR
+T	17	(1)
+End page
+Finish
+

tests/bug-308.sil

@@ -0,0 +1,13 @@
+\begin[class=book]{document}%
+\script[src=packages/frametricks]
+\begin[first-content-frame=column1]{pagetemplate}
+  \frame[id=gutter,width=3%]
+  \frame[id=title, top=top(content), bottom=top(title)+5%, left=left(content), right=right(content),next=column1]
+  \frame[id=column1,left=left(content),top=bottom(title)+2,bottom=bottom(content),width=53pt]
+\end{pagetemplate}
+\par
+\font[family=Noto Sans Malayalam,language=ml,size=12pt]
+
+\noindent{}
+സംസാരിച്ചിരിക്കുക 
+\end{document}