Don't return a feature if there are no coordinates

src/ol/format/igcformat.js

@@ -156,6 +156,9 @@ ol.format.IGC.prototype.readFeatureFromText = function(text) {
       }
     }
   }
+  if (flatCoordinates.length === 0) {
+    return null;
+  }
   var lineString = new ol.geom.LineString(null);
   var layout = altitudeMode == ol.format.IGCZ.NONE ?
       ol.geom.GeometryLayout.XYM : ol.geom.GeometryLayout.XYZM;

test/spec/ol/format/igcformattest.js

@@ -0,0 +1,29 @@
+goog.provide('ol.test.format.IGC');
+
+
+describe('ol.format.IGC', function() {
+
+  var format;
+  beforeEach(function() {
+    format = new ol.format.IGC();
+  });
+
+  describe('#readFeature', function() {
+
+    it('does not read invalid features', function() {
+      expect(format.readFeature('invalid')).to.be(null);
+    });
+
+  });
+
+  describe('#readFeatures', function() {
+
+    it('does not read invalid features', function() {
+      expect(format.readFeatures('invalid')).to.be.empty();
+    });
+
+  });
+
+});
+
+goog.require('ol.format.IGC');