Add NotNullOrEmptyMatcher (#625)

src/WireMock.Net/Matchers/NotNullOrEmptyMatcher.cs

@@ -0,0 +1,52 @@
+using System.Linq;
+
+namespace WireMock.Matchers
+{
+    /// <summary>
+    /// NotNullOrEmptyMatcher
+    /// </summary>
+    /// <seealso cref="IObjectMatcher" />
+    public class NotNullOrEmptyMatcher : IObjectMatcher
+    {
+        /// <inheritdoc cref="IMatcher.Name"/>
+        public string Name => "NotNullOrEmptyMatcher";
+
+        /// <inheritdoc cref="IMatcher.MatchBehaviour"/>
+        public MatchBehaviour MatchBehaviour { get; }
+
+        /// <inheritdoc cref="IMatcher.ThrowException"/>
+        public bool ThrowException { get; }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="NotNullOrEmptyMatcher"/> class.
+        /// </summary>
+        /// <param name="matchBehaviour">The match behaviour.</param>
+        public NotNullOrEmptyMatcher(MatchBehaviour matchBehaviour = MatchBehaviour.AcceptOnMatch)
+        {
+            MatchBehaviour = matchBehaviour;
+        }
+
+        /// <inheritdoc cref="IObjectMatcher.IsMatch"/>
+        public double IsMatch(object input)
+        {
+            bool match;
+
+            switch (input)
+            {
+                case string @string:
+                    match = !string.IsNullOrEmpty(@string);
+                    break;
+
+                case byte[] bytes:
+                    match = bytes != null && bytes.Any();
+                    break;
+
+                default:
+                    match = input != null;
+                    break;
+            }
+
+            return MatchBehaviourHelper.Convert(MatchBehaviour, MatchScores.ToScore(match));
+        }
+    }
+}