return null instead of throwing if no accounts are found

Author: GuillaumeRx

packages/snaps-controllers/coverage.json

@@ -1,5 +1,5 @@
 {
-  "branches": 94.6,
+  "branches": 94.61,
   "functions": 98.45,
   "lines": 98.71,
   "statements": 98.55

packages/snaps-controllers/src/interface/utils.test.tsx

@@ -1772,7 +1772,7 @@ describe('getAccountSelectorDefaultStateValue', () => {
 
     const listAccounts = jest.fn().mockReturnValue([]);
 
-    expect(() =>
+    expect(
       getAccountSelectorDefaultStateValue(
         <AccountSelector
           name="foo"
@@ -1786,7 +1786,7 @@ describe('getAccountSelectorDefaultStateValue', () => {
           snapOwnsAccount: jest.fn(),
         },
       ),
-    ).toThrow('No accounts found for the provided chain IDs.');
+    ).toBeNull();
   });
 
   it('throws if no account that the snap owns is found for the given chain IDs', () => {
@@ -1800,7 +1800,7 @@ describe('getAccountSelectorDefaultStateValue', () => {
 
     const snapOwnsAccount = jest.fn().mockReturnValue(false);
 
-    expect(() =>
+    expect(
       getAccountSelectorDefaultStateValue(
         <AccountSelector
           name="foo"
@@ -1815,7 +1815,7 @@ describe('getAccountSelectorDefaultStateValue', () => {
           snapOwnsAccount,
         },
       ),
-    ).toThrow('No accounts found for the provided chain IDs.');
+    ).toBeNull();
   });
 });
 

packages/snaps-controllers/src/interface/utils.ts

@@ -313,10 +313,11 @@ export function getAccountSelectorDefaultStateValue(
     ? accounts.filter((account) => snapOwnsAccount(account))
     : accounts;
 
-  assert(
-    filteredAccounts.length > 0,
-    'No accounts found for the provided chain IDs.',
-  );
+  // The AccountSelector component in the UI will be disabled if there is no account available for the networks provided.
+  // In this case, we return null to indicate that there is no default selected account.
+  if (filteredAccounts.length === 0) {
+    return null;
+  }
 
   return formatAccountSelectorStateValue(filteredAccounts[0], chainIds);
 }