fix($parse): fix parsing error with leading space and one time bind

[cexbrayat]

Easy way to fix #7640 : add a simple trim when expression is parsed.

[mary-poppins]

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[btford]

This seems like the right thing to do. @caitp @IgorMinar thoughts?

[caitp]

I don't think it's a problem. My prototype did something similar, with regular expressions+grouping instead of trim, but since we don't need labels right now, maybe trim is a better approach.

edit by "I don't think it's a problem", I really mean LGTM

[IgorMinar]

LGTM

[btford]

Landed as 24c844d. Thanks @cexbrayat!