Update country_code.dart

Added methods tryFromCountryCode and tryFromDialCode, which has nullable result

lib/src/country_code.dart

@@ -39,6 +39,15 @@ class CountryCode {
     return CountryCode.fromJson(jsonCode!);
   }
 
+  static CountryCode? tryFromCountryCode(String countryCode) {
+    try {
+      return CountryCode.fromCountryCode(countryCode);
+    } catch (e) {
+      if (kDebugMode) print('Failed to recognize country from countryCode: $countryCode');
+      return null;
+    }
+  }
+
   factory CountryCode.fromDialCode(String dialCode) {
     final Map<String, String>? jsonCode = codes.firstWhereOrNull(
       (code) => code['dial_code'] == dialCode,
@@ -46,6 +55,15 @@ class CountryCode {
     return CountryCode.fromJson(jsonCode!);
   }
 
+  static CountryCode? tryFromDialCode(String dialCode)
+    try {
+      return CountryCode.fromDialCode(dialCode);
+    } catch (e) {
+      if (kDebugMode) print('Failed to recognize country from dialCode: $dialCode');
+      return null;
+    }
+  }
+
   CountryCode localize(BuildContext context) {
     return this
       ..name = CountryLocalizations.of(context)?.translate(code) ?? name;