Resolve parsing issue when first field is empty and unquoted (#696)

papaparse.js

@@ -1608,7 +1608,7 @@ License: MIT
 						var nextDelimObj = getNextUnqotedDelimiter(nextDelim, quoteSearch, nextNewline);
 
 						// if we have next delimiter char which is not enclosed in quotes
-						if (nextDelimObj && nextDelimObj.nextDelim) {
+						if (nextDelimObj && typeof nextDelimObj.nextDelim !== 'undefined') {
 							nextDelim = nextDelimObj.nextDelim;
 							quoteSearch = nextDelimObj.quoteSearch;
 							row.push(input.substring(cursor, nextDelim));

tests/test-cases.js

@@ -323,6 +323,14 @@ var CORE_PARSER_TESTS = [
 			errors: []
 		}
 	},
+	{
+		description: "Line starts with unquoted empty field",
+		input: ',b,c\n"d",e,f',
+		expected: {
+			data: [['', 'b', 'c'], ['d', 'e', 'f']],
+			errors: []
+		}
+	},
 	{
 		description: "Line ends with quoted field",
 		input: 'a,b,c\nd,e,f\n"g","h","i"\n"j","k","l"',