bzzparse returns 0 when fails to read included file

[Xavier Groleau]

When an included file is not found, bzzparse returns 0. Our compilation pipelines still continues even if the compilation failed and we end up with invalid nop only bytecode.

To reproduce:

The in.bzz file

include "invalid_file.bzz"

The shell script

bzzparse in.bzz out.basm # Prints "Can't read 'invalid_file.bzz'"
echo $? # Returns 0, should return a non-zero error code

[Giovanni Beltrame]

Thank you for finding this issue. There are a couple of places where missed a check for a valid include.