Remove whitespaces from error msg.

[mbaranovski]

Fix for #3398
Switched from string template to normal string concatenation in order to avoid white spaces in the console output after reformating with prettier.

[apollo-cla]

	Warnings
⚠️	There are library changes, but not tests. That's OK as long as you're refactoring existing code

Generated by 🚫 dangerJS

[hwillson]

Thanks very much for this @mbaranovski!