Replace blank account name with null (#6158)

Author: david-livefront

authenticator/src/main/kotlin/com/bitwarden/authenticator/ui/authenticator/feature/manualcodeentry/ManualCodeEntryViewModel.kt

@@ -147,7 +147,7 @@ class ManualCodeEntryViewModel @Inject constructor(
                     id = UUID.randomUUID().toString(),
                     key = sanitizedCode,
                     issuer = state.issuer,
-                    accountName = "",
+                    accountName = null,
                     userId = null,
                     type = if (isSteamCode) {
                         AuthenticatorItemType.STEAM

authenticator/src/test/kotlin/com/bitwarden/authenticator/ui/authenticator/feature/manualcodeentry/ManualCodeEntryViewModelTest.kt

@@ -161,7 +161,7 @@ class ManualCodeEntryViewModelTest : BaseViewModelTest() {
                         id = "mockUUID",
                         key = "ABCD",
                         issuer = "mockIssuer",
-                        accountName = "",
+                        accountName = null,
                         userId = null,
                         favorite = false,
                         type = AuthenticatorItemType.TOTP,
@@ -182,7 +182,7 @@ class ManualCodeEntryViewModelTest : BaseViewModelTest() {
                         id = "mockUUID",
                         key = "ABCD",
                         issuer = "mockIssuer",
-                        accountName = "",
+                        accountName = null,
                         userId = null,
                         favorite = false,
                         type = AuthenticatorItemType.TOTP,
@@ -258,7 +258,7 @@ class ManualCodeEntryViewModelTest : BaseViewModelTest() {
                     id = "mockUUID",
                     key = "ABCD",
                     issuer = "mockIssuer",
-                    accountName = "",
+                    accountName = null,
                     userId = null,
                     favorite = false,
                     type = AuthenticatorItemType.TOTP,
@@ -281,7 +281,7 @@ class ManualCodeEntryViewModelTest : BaseViewModelTest() {
                     id = "mockUUID",
                     key = "ABCD",
                     issuer = "mockIssuer",
-                    accountName = "",
+                    accountName = null,
                     userId = null,
                     favorite = false,
                     type = AuthenticatorItemType.TOTP,
@@ -354,7 +354,7 @@ class ManualCodeEntryViewModelTest : BaseViewModelTest() {
                     id = "mockUUID",
                     key = "ABCD",
                     issuer = "mockIssuer",
-                    accountName = "",
+                    accountName = null,
                     userId = null,
                     favorite = false,
                     type = AuthenticatorItemType.STEAM,
@@ -377,7 +377,7 @@ class ManualCodeEntryViewModelTest : BaseViewModelTest() {
                     id = "mockUUID",
                     key = "ABCD",
                     issuer = "mockIssuer",
-                    accountName = "",
+                    accountName = null,
                     userId = null,
                     favorite = false,
                     type = AuthenticatorItemType.STEAM,