Added checks to bokeh blur constructor

src/ImageSharp/Processing/Processors/Convolution/BokehBlurProcessor.cs

@@ -47,6 +47,8 @@ namespace SixLabors.ImageSharp.Processing.Processors.Convolution
         /// </param>
         public BokehBlurProcessor(int radius, int components, float gamma)
         {
+            Guard.MustBeGreaterThan(radius, 0, nameof(radius));
+            Guard.MustBeBetweenOrEqualTo(components, 1, 6, nameof(components));
             Guard.MustBeGreaterThanOrEqualTo(gamma, 1, nameof(gamma));
 
             this.Radius = radius;