Don't force filters to have Since

Author: tclem

LibGit2Sharp.Tests/CommitFixture.cs

@@ -98,7 +98,6 @@ public void QueryingTheCommitHistoryWithUnknownShaOrInvalidEntryPointThrows()
             {
                 Assert.Throws<LibGit2SharpException>(() => repo.Commits.QueryBy(new Filter { Since = Constants.UnknownSha }).Count());
                 Assert.Throws<LibGit2SharpException>(() => repo.Commits.QueryBy(new Filter { Since = "refs/heads/deadbeef" }).Count());
-                Assert.Throws<ArgumentNullException>(() => repo.Commits.QueryBy(new Filter { Since = null }).Count());
             }
         }
 
@@ -120,8 +119,6 @@ public void QueryingTheCommitHistoryWithBadParamsThrows()
         {
             using (var repo = new Repository(BareTestRepoPath))
             {
-                Assert.Throws<ArgumentException>(() => repo.Commits.QueryBy(new Filter { Since = string.Empty }));
-                Assert.Throws<ArgumentNullException>(() => repo.Commits.QueryBy(new Filter { Since = null }));
                 Assert.Throws<ArgumentNullException>(() => repo.Commits.QueryBy(null));
             }
         }

LibGit2Sharp/CommitLog.cs

@@ -80,8 +80,6 @@ IEnumerator IEnumerable.GetEnumerator()
         public ICommitLog QueryBy(Filter filter)
         {
             Ensure.ArgumentNotNull(filter, "filter");
-            Ensure.ArgumentNotNull(filter.Since, "filter.Since");
-            Ensure.ArgumentNotNullOrEmptyString(filter.Since.ToString(), "filter.Since");
 
             return new CommitLog(repo, filter);
         }