fix: fix example

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---

Author: sagar7162

lib/node_modules/@stdlib/stats/incr/nanmape/examples/index.js

@@ -36,6 +36,8 @@ for ( i = 0; i < 100; i++ ) {
 	v1 = ( randu() < 0.2 ) ? NaN : randu() * 100.0;
 	v2 = ( randu() < 0.2 ) ? NaN : randu() * 100.0;
 	err = accumulator( v1, v2 );
-	console.log( '%d\t%d\t%d', v1.toFixed( 3 ), v2.toFixed( 3 ), err.toFixed( 3 ) );
+	if ( err !== null ) {
+		console.log( '%d\t%d\t%d', v1.toFixed( 3 ), v2.toFixed( 3 ), err.toFixed( 3 ) );
+	}
 }
 console.log( '\nFinal MAPE: %d\n', accumulator() );