updated the main.js

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---

Author: jalajk3004

lib/node_modules/@stdlib/stats/incr/nanrange/libs/main.js

@@ -57,6 +57,7 @@ function incrnanrange() {
 	var range;
 	var max = NINF;
 	var min = PINF;
+	var hasValidValue = false;
 
 	return accumulator;
 
@@ -69,7 +70,7 @@ function incrnanrange() {
 	*/
 	function accumulator( x ) {
 		if ( arguments.length === 0 ) {
-			return ( range === void 0 ) ? null : range;
+			return hasValidValue ? range : null;
 		}
 		if ( isnan( x ) ) {
 			return range;
@@ -80,6 +81,7 @@ function incrnanrange() {
 		if ( x < min ) {
 			min = x;
 		}
+		hasValidValue = true;
 		range = max - min;
 		return range;
 	}