#390 Paint on surface

[Khara Yates]

I attempted to import a raw block (.csd) and then open a mask or paint msr. and this error
message came up:

java.lang.NullPointerException
at kawa.lib.syntax.error$V(syntax.scm:51)
at blox.lib.blox.$PcFileOpenMaskOrMeasure(blox.scm:1209)
at java.lang.reflect.Method.invoke(Native Method)
at gnu.expr.PrimProcedure.applyV(PrimProcedure.java:131)
at gnu.mapping.MethodProc.applyN(MethodProc.java:80)
at gnu.expr.ApplyExp.eval(ApplyExp.java:38)
at gnu.expr.ModuleExp.evalModule(ModuleExp.java:38)
at blox.Shell.run(Shell.java:82)
at blox.Shell.run(Shell.java:33)
at blox.Blox.apply0(Blox.java:92)
at gnu.mapping.Future.run(Future.java:59)