now not adding title slide if meta information is not available

src/Parser.js

@@ -23,7 +23,7 @@ const tokenize = string => {
 const injectTitle = (deck, meta) => {
 	const title = [];
 
-	if (meta.title)
+	if (meta?.title)
 		title.push({
 			type   : "heading",
 			level  : 1,
@@ -34,7 +34,7 @@ const injectTitle = (deck, meta) => {
 				}
 			]
 		});
-	if (meta.author)
+	if (meta?.author)
 		title.push({
 			type   : "paragraph",
 			tokens : [
@@ -44,7 +44,7 @@ const injectTitle = (deck, meta) => {
 				},
 			]
 		});
-	if (meta.email)
+	if (meta?.email)
 		title.push({
 			type   : "paragraph",
 			tokens : [
@@ -54,9 +54,12 @@ const injectTitle = (deck, meta) => {
 				},
 			]
 		});
+
+	if (title.length > 0) {
 		const slide = new Slide(title);
 		slide.title = true;
 		deck.unshift(slide);
+	}
 
 	return deck;
 }