update empty string to null

src/components/projectBlock.vue

@@ -7,7 +7,7 @@
       <q-btn
         rounded color="primary"
         class="w100 q-mt-md q-mb-xs"
-        :disable="!(isFormValid && (isDirty(initialProject, modelValue)))"
+        :disable="!isFormValid"
         @click = "emit('update')"
         >
         {{ $t(btnText) }}
@@ -64,7 +64,6 @@
 <script setup lang="ts">
   import { onMounted, computed, ref } from 'vue'
   import { useI18n } from 'vue-i18n'
-  import { isDirty } from 'helpers/helpers'
   import type { ProjectParams } from 'types/Project'
 
   const { t } = useI18n()