Remove unnecessary goog.isDefAndNotNull() calls
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@@ -723,8 +723,7 @@ ol.interaction.Draw.prototype.extend = function(feature) {
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var geometry = feature.getGeometry();
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goog.asserts.assert(this.mode_ == ol.interaction.DrawMode.LINE_STRING,
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'interaction mode must be "line"');
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goog.asserts.assert(goog.isDefAndNotNull(geometry),
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'feature must have a geometry');
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goog.asserts.assert(geometry, 'feature must have a geometry');
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goog.asserts.assert(geometry.getType() == ol.geom.GeometryType.LINE_STRING,
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'feature geometry must be a line string');
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var lineString = /** @type {ol.geom.LineString} */ (geometry);
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