blank lines in test file

Author: Lehonti

tests/Pinta.Core.Tests/Assets/sixcolors_chaotic.ppm

@@ -9,7 +9,9 @@ P3
 # 1 1 1 # This should not be read
 # Look at the trailing space below
 	0 1  	0 0 0 1              
+
+
 1 1   0   1 1 1    0   0   0
 # The following data goes beyond what was specified in the header,
 # and it should be ignored. In fact, let's add an out-of-range value
-1 0 1 65535
+1 0 1 65535