code: private boolean kernelNo0s( int[] kernel ) {
          for( int i = 0; i < kernel.length; ++i ) {
              if (kernel[i] == 0)
                  return false;
          }
          return true;
      }
docs: Returns true if the kernel has no 0s.
  
  @param kernel the array storing the kernel values.
  @return True if no 0s (false otherwise)