Initialized IgnoreConfig is empty

Author: mirecad

src/GitVersionCore.Tests/Model/IgnoreConfigTests.cs

@@ -0,0 +1,19 @@
+using GitVersion.Model.Configuration;
+using GitVersionCore.Tests.Helpers;
+using NUnit.Framework;
+using Shouldly;
+
+namespace GitVersionCore.Tests
+{
+    [TestFixture]
+    public class IgnoreConfigTests : TestBase
+    {
+        [Test]
+        public void NewInstanceShouldBeEmpty()
+        {
+            var ignoreConfig = new IgnoreConfig();
+
+            ignoreConfig.IsEmpty.ShouldBeTrue();
+        }
+    }
+}

src/GitVersionCore/Model/Configuration/IgnoreConfig.cs

@@ -19,7 +19,8 @@ public IgnoreConfig()
         [YamlMember(Alias = "sha")]
         public IEnumerable<string> ShAs { get; set; }
 
-        public virtual bool IsEmpty => Before == null && ShAs == null;
+        public virtual bool IsEmpty => Before == null
+                                       && (ShAs == null || ShAs.Any() == false);
 
         public virtual IEnumerable<IVersionFilter> ToFilters()
         {