Fix nullish types

packages/frontend-core/src/components/grid/stores/datasources/nonPlus.ts

@@ -91,7 +91,7 @@ export const initialise = (context: StoreContext) => {
     }
 
     // Wipe state
-    filter.set(get(initialFilter))
+    filter.set(get(initialFilter) ?? undefined)
     inlineFilters.set([])
     sort.set({
       column: get(initialSortColumn),

packages/frontend-core/src/components/grid/stores/datasources/table.ts

@@ -108,7 +108,7 @@ export const initialise = (context: StoreContext) => {
     }
 
     // Wipe state
-    filter.set(get(initialFilter))
+    filter.set(get(initialFilter) ?? undefined)
     inlineFilters.set([])
     sort.set({
       column: get(initialSortColumn),

packages/frontend-core/src/components/grid/stores/datasources/viewV2.ts

@@ -121,7 +121,7 @@ export const initialise = (context: StoreContext) => {
     }
 
     // Reset state for new view
-    filter.set(get(initialFilter))
+    filter.set(get(initialFilter) ?? undefined)
     inlineFilters.set([])
     sort.set({
       column: get(initialSortColumn),

packages/frontend-core/src/components/grid/stores/filter.ts

@@ -120,5 +120,7 @@ export const initialise = (context: StoreContext) => {
   const { filter, initialFilter } = context
 
   // Reset filter when initial filter prop changes
-  initialFilter.subscribe(filter.set)
+  initialFilter.subscribe($initialFilter =>
+    filter.set($initialFilter ?? undefined)
+  )
 }