fix(frontend): improper usage of isEmpty

Author: IgnisDa

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "ryot"
-version = "5.3.2"
+version = "5.3.3"
 edition = "2021"
 repository = "https://github.com/IgnisDa/ryot"
 license = "GPL-3.0"

apps/backend/Cargo.toml

@@ -59,7 +59,6 @@ import {
 } from "@ryot/generated/graphql/backend/graphql";
 import {
 	displayWeightWithUnit,
-	isEmpty,
 	isEqual,
 	snakeCase,
 	startCase,
@@ -531,7 +530,7 @@ const StatInput = (props: {
 		if (currentWorkout)
 			setCurrentWorkout(
 				produce(currentWorkout, (draft) => {
-					const val = isEmpty(value) ? undefined : Number(value);
+					const val = value === "" ? undefined : Number(value);
 					draft.exercises[props.exerciseIdx].sets[props.setIdx].statistic[
 						props.stat
 					] = val as unknown as null;