Fix ImageMetaData test

src/ImageSharp/MetaData/Profiles/Exif/ExifProfile.cs

@@ -84,9 +84,12 @@ namespace ImageSharp
                 }
             }
 
+            if (other.data != null)
+            {
                 this.data = new byte[other.data.Length];
                 Buffer.BlockCopy(other.data, 0, this.data, 0, other.data.Length);
             }
+        }
 
         /// <summary>
         /// Gets or sets which parts will be written when the profile is added to an image.
@@ -131,7 +134,7 @@ namespace ImageSharp
                 return null;
             }
 
-            if (this.data.Length < (this.thumbnailOffset + this.thumbnailLength))
+            if (this.data == null || this.data.Length < (this.thumbnailOffset + this.thumbnailLength))
             {
                 return null;
             }

src/ImageSharp/MetaData/Profiles/ICC/IccProfile.cs

@@ -59,9 +59,12 @@ namespace ImageSharp
             Guard.NotNull(other, nameof(other));
 
             // TODO: Do we need to copy anything else?
+            if (other.data != null)
+            {
                 this.data = new byte[other.data.Length];
                 Buffer.BlockCopy(other.data, 0, this.data, 0, other.data.Length);
             }
+        }
 
         /// <summary>
         /// Initializes a new instance of the <see cref="IccProfile"/> class.