Crash when suggesting empty symbol names.

[Y-Less]

Issue description:

The code below crashes on this line:

compiler/source/compiler/sc5.c

Line 469 in c565a5d

assert(n>0 && m>0);

Immediately before this there is an error 020 invalid symbol name "". I don't know why that symbol name is being picked up, but that's at least where it comes from for this error.

Minimal complete verifiable example (MCVE):

const static SIZE = 2;

new arr[SIZE];

main() {}

Workspace Information:

• Compiler version:
• Command line arguments provided (or sampctl version):
• Operating System: