Compiler generates an output when module name is not declared

[ryu-bu]

Describe the bug
Compiler generates an output when module name is not declared

To Reproduce
Steps to reproduce the behavior:

1. set

module (
     something
);
     something
endmodule

2. then compile, it will generate an output with a name ".dot"

Expected behavior
Should throw an error message

Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

[rkrishnasanka]

I added a checker that will stop the design process if it encounters any errors: 28d227f