Allow margin swapping with no sell asset (#412)

src/components/Account/AccountSummary.tsx

@@ -1,6 +1,6 @@
 import { HTMLAttributes, useMemo } from 'react'
-
 import classNames from 'classnames'
+
 import Accordion from 'components/Accordion'
 import AccountBalancesTable from 'components/Account/AccountBalancesTable'
 import AccountComposition from 'components/Account/AccountComposition'

src/components/RangeInput/InputOverlay.tsx

@@ -29,7 +29,7 @@ function InputOverlay({ max, value, marginThreshold }: Props) {
         {Array.from(Array(9).keys()).map((i) => (
           <div key={`mark-${i}`} className={className.mark} />
         ))}
-        {marginThreshold && (
+        {marginThreshold !== undefined && (
           <div
             key='margin-mark'
             className={className.marginMarkContainer}