Corrige error con número de muestras menor que 1.

js/main.js

@@ -56,7 +56,7 @@ function resample() {
 	let t_low = l.value;
 	let t_high = h.value;
 	
-	if (isNaN(t_samples)) s.value = samples;
+	if (isNaN(t_samples) || t_samples < 1) s.value = samples;
 	if (isNaN(t_low) || t_low < 1915) l.value = year_low;
 	if (isNaN(t_high) || t_high > 2019) h.value = year_high;
 	if (!isNaN(t_low) && isNaN(t_high) && t_low > t_high) {