Implement requested minor changes

ts/state/ducks/search.ts

@@ -175,7 +175,7 @@ function filterMessages(
   contacts: Array<string>
 ) {
   let filteredMessages = messages;
-  if (filters.from !== null && filters.from.length > 0) {
+  if (filters.from && filters.from.length > 0) {
     if (filters.from === '@me') {
       filteredMessages = filteredMessages.filter(message => message.sent);
     } else {

ts/types/Search.ts

@@ -7,7 +7,7 @@ export type SearchOptions = {
 
 export type AdvancedSearchOptions = {
   query: string;
-  from: string;
+  from?: string;
   before: number;
   after: number;
 };