fix: Various React warnings

app/scenes/Search/components/CollectionFilter.js

@@ -5,7 +5,7 @@ import CollectionsStore from "stores/CollectionsStore";
 import FilterOptions from "./FilterOptions";
 
 const defaultOption = {
-  key: undefined,
+  key: "",
   label: "Any collection",
 };
 

app/scenes/Search/components/DateFilter.js

@@ -3,7 +3,7 @@ import * as React from "react";
 import FilterOptions from "./FilterOptions";
 
 const options = [
-  { key: undefined, label: "Any time" },
+  { key: "", label: "Any time" },
   { key: "day", label: "Past day" },
   { key: "week", label: "Past week" },
   { key: "month", label: "Past month" },

app/scenes/Search/components/FilterOptions.js

@@ -8,7 +8,7 @@ import FilterOption from "./FilterOption";
 
 type Props = {
   options: {
-    key: ?string,
+    key: string,
     label: string,
     note?: string,
   }[],
@@ -20,7 +20,7 @@ type Props = {
 
 const FilterOptions = ({
   options,
-  activeKey,
+  activeKey = "",
   defaultLabel,
   selectedPrefix = "",
   onSelect,

app/scenes/Search/components/StatusFilter.js

@@ -4,7 +4,7 @@ import FilterOptions from "./FilterOptions";
 
 const options = [
   {
-    key: undefined,
+    key: "",
     label: "Active documents",
     note: "Documents in collections you are able to access",
   },

app/scenes/Search/components/UserFilter.js

@@ -5,7 +5,7 @@ import UsersStore from "stores/UsersStore";
 import FilterOptions from "./FilterOptions";
 
 const defaultOption = {
-  key: undefined,
+  key: "",
   label: "Any author",
 };