fix: handle last section in getTOCTitleByPage()

unireader.lua

@@ -561,13 +561,20 @@ function UniReader:getTOCTitleByPage(pageno)
 		-- build toc when needed.
 		self:fillTOC()
 	end
+
+	-- no table of content
+	if #self.toc == 0 then
+		return ""
+	end
 	
+	local pre_entry = self.toc[1]
 	for _k,_v in ipairs(self.toc) do
-		if _v.page >= pageno then
-			return self:cleanUpTOCTitle(_v.title)
+		if _v.page > pageno then
+			break
 		end
+		pre_entry = _v
 	end
-	return ""
+	return self:cleanUpTOCTitle(pre_entry.title)
 end
 
 function UniReader:showTOC()