Fix tests, improve coverage.

app/Http/Controllers/Transaction/LinkController.php

@@ -107,7 +107,7 @@ class LinkController extends Controller
 
             return redirect(route('transactions.show', [$journal->id]));
         }
-        $other         = $this->journalRepository->find($linkInfo['transaction_journal_id']);
+        $other         = $this->journalRepository->findNull($linkInfo['transaction_journal_id']);
         $alreadyLinked = $this->repository->findLink($journal, $other);
 
         if ($other->id === $journal->id) {

app/Http/Middleware/Authenticate.php

@@ -104,7 +104,9 @@ class Authenticate
                     }
                 }
             } catch (QueryException $e) {
+                // @codeCoverageIgnoreStart
                 throw new FireflyException('It seems the database has not yet been initialized. Did you run the correct upgrade or installation commands?');
+                // @codeCoverageIgnoreEnd
             }
 
             return $this->auth->authenticate();