fix: catch exceptions when checking for updates

Resolves #195

lib/app_version/app_version.dart

@@ -2,6 +2,7 @@ import 'dart:convert';
 
 import 'package:flutter/foundation.dart';
 import 'package:http/http.dart' as http;
+import 'package:http/http.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 import 'package:pub_semver/pub_semver.dart' as semver;
 
@@ -34,13 +35,23 @@ class AppVersion {
   /// Gets the latest version from the GitHub tag.
   Future<String> latest() async {
     if (_latest != '') return _latest;
+
     final uri = Uri.parse(
       'https://api.github.com/repos/merrit/nyrna/releases',
     );
-    final response = await http.get(
-      uri,
-      headers: {'Accept': 'application/vnd.github.v3+json'},
-    );
+
+    final Response response;
+
+    try {
+      response = await http.get(
+        uri,
+        headers: {'Accept': 'application/vnd.github.v3+json'},
+      );
+    } on Exception catch (e) {
+      log.w('Issue getting latest version info from GitHub: $e\n');
+      return '';
+    }
+
     if (response.statusCode == 200) {
       final json = jsonDecode(response.body) as List;
       final data = List<Map>.from(json);
@@ -51,6 +62,7 @@ class AppVersion {
       log.w('Issue getting latest version info from GitHub, '
           'status code: ${response.statusCode}\n');
     }
+
     return _latest;
   }
 

lib/updates/update_service.dart

@@ -1,6 +1,7 @@
 import 'dart:convert';
 
 import 'package:http/http.dart' as http;
+import 'package:http/http.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 import 'package:pub_semver/pub_semver.dart';
 
@@ -46,10 +47,17 @@ class UpdateService {
       'https://api.github.com/repos/merrit/nyrna/releases',
     );
 
-    final response = await http.get(
-      uri,
-      headers: {'Accept': 'application/vnd.github.v3+json'},
-    );
+    final Response response;
+
+    try {
+      response = await http.get(
+        uri,
+        headers: {'Accept': 'application/vnd.github.v3+json'},
+      );
+    } on Exception catch (e) {
+      log.w('Issue getting latest version info from GitHub: $e\n');
+      return null;
+    }
 
     if (response.statusCode == 200) {
       final json = jsonDecode(response.body) as List;