For null string values for candidate and party, set them to an empty string (#313)

Created C# unit test

bindings/netstandard/ElectionGuard/ElectionGuard.Encryption.Tests/TestElection.cs

@@ -19,6 +19,36 @@ namespace ElectionGuard.Encrypt.Tests
             Assert.IsTrue(result.AllowedOverVotes);
         }
 
+        [Test]
+        public void Test_Can_Create_Party()
+        {
+            var candidateName = new Language("father time", "en");
+            var candidate = new Candidate(
+                "2022-holidays",
+                new InternationalizedText(new[] { candidateName }),
+                "new-years-id",
+                null,
+                false);
+
+
+            var partyName = new Language("new years", "en");
+            var party = new ElectionGuard.Party(
+                "new-years-id",
+                new InternationalizedText(new[] { partyName }),
+                "ny",
+                null,
+                null);
+
+            // Assert
+            Assert.IsNotNull(candidate);
+            Assert.IsNotNull(party);
+        }
+
+
+
+
+
+
         [Test]
         public void Test_Can_Deserialize_Ciphertext_Election_Context()
         {

bindings/netstandard/ElectionGuard/ElectionGuard.Encryption/Manifest.cs

@@ -824,7 +824,7 @@ namespace ElectionGuard
             string abbreviation, string color, string logoUri)
         {
             var status = NativeInterface.Party.New(
-                objectId, name.Handle, abbreviation, color, logoUri, out Handle);
+                objectId, name.Handle, abbreviation, color ?? string.Empty, logoUri ?? string.Empty, out Handle);
             if (status != Status.ELECTIONGUARD_STATUS_SUCCESS)
             {
                 throw new ElectionGuardException($"Party Error Status: {status}");
@@ -1009,7 +1009,7 @@ namespace ElectionGuard
             string partyId, string imageUri, bool isWriteIn)
         {
             var status = NativeInterface.Candidate.New(
-                objectId, name.Handle, partyId, imageUri, isWriteIn, out Handle);
+                objectId, name.Handle, partyId, imageUri ?? string.Empty, isWriteIn, out Handle);
             if (status != Status.ELECTIONGUARD_STATUS_SUCCESS)
             {
                 throw new ElectionGuardException($"Candidate Error Status: {status}");