Fix step callback function when skipping empty lines (#714)

Fixes #672

papaparse.js

@@ -1036,9 +1036,11 @@ License: MIT
 					_stepCounter += results.data.length;
 					if (_config.preview && _stepCounter > _config.preview)
 						_parser.abort();
-					else
+					else {
+						_results.data = _results.data[0];
 						userStep(_results, self);
 					}
+				}
 			};
 		}
 
@@ -1706,11 +1708,10 @@ License: MIT
 			}
 
 			/** Returns an object with the results, errors, and meta. */
-			function returnable(stopped, step)
+			function returnable(stopped)
 			{
-				var isStep = step || false;
 				return {
-					data: isStep ? data[0]  : data,
+					data: data,
 					errors: errors,
 					meta: {
 						delimiter: delim,
@@ -1725,7 +1726,7 @@ License: MIT
 			/** Executes the user's step function and resets data & errors. */
 			function doStep()
 			{
-				step(returnable(undefined, true));
+				step(returnable());
 				data = [];
 				errors = [];
 			}

tests/test-cases.js

@@ -1973,6 +1973,22 @@ var CUSTOM_TESTS = [
 			});
 		}
 	},
+	{
+		description: "Data is correctly parsed with steps when skipping empty lines",
+		expected: [['A', 'b', 'c'], ['d', 'E', 'f']],
+		run: function(callback) {
+			var data = [];
+			Papa.parse('A,b,c\n\nd,E,f', {
+				skipEmptyLines: true,
+				step: function(results) {
+					data.push(results.data);
+				},
+				complete: function() {
+					callback(data);
+				}
+			});
+		}
+	},
 	{
 		description: "Step is called with the contents of the row",
 		expected: ['A', 'b', 'c'],