Add migration for changed wifi. Fix selection issue with unlinking repo.

src/vorta/models.py

@@ -9,7 +9,7 @@ import json
 from datetime import datetime
 from playhouse.migrate import SqliteMigrator, migrate
 
-SCHEMA_VERSION = 4
+SCHEMA_VERSION = 5
 
 db = pw.Proxy()
 
@@ -172,4 +172,9 @@ def init_db(con):
             migrator.add_column(SnapshotModel._meta.table_name, 'duration', pw.FloatField(null=True)),
             migrator.add_column(SnapshotModel._meta.table_name, 'size', pw.IntegerField(null=True))
         )
+    if current_schema.version < 5:
+        _apply_schema_update(
+            current_schema, 5,
+            migrator.drop_not_null(WifiSettingModel._meta.table_name, 'last_connected'),
+        )
 

src/vorta/views/repo_tab.py

@@ -165,7 +165,7 @@ class RepoTab(RepoBase, RepoUI, BackupProfileMixin):
         msg.setParent(self, QtCore.Qt.Sheet)
         selected_repo_id = self.repoSelector.currentData()
         selected_repo_index = self.repoSelector.currentIndex()
-        if selected_repo_id is not None:
+        if selected_repo_index > 2:
             repo = RepoModel.get(id=selected_repo_id)
             repo.delete_instance()
             profile.repo = None