Fixed #1542 - InputNumber: setting "min" to anything greater than 0 i…

…mplies "required"

src/components/inputnumber/InputNumber.vue

@@ -776,6 +776,10 @@ export default {
             return false;
         },
         validateValue(value) {
+            if (value === '-' || value == null) {
+                return null;
+            }
+
             if (this.min != null && value < this.min) {
                 return this.min;
             }
@@ -784,10 +788,6 @@ export default {
                 return this.max;
             }
 
-            if (value === '-') { // Minus sign
-                return null;
-            }
-
             return value;
         },
         updateInput(value, insertedValueStr, operation, valueStr) {