Can vue-cli detect the syntax error when import an empty string?

[givingwu]

What problem does this feature solve?

when user import an empty string like import '' in SFC, the webpack build will stuck at 98% after emitting CopyPlugin.

• issue#4174
• issue#4252

What does the proposed API look like?

Hope the vue-template-compiler could check the path string is an available string for require(path) or not, and if no then use the error-overlay to indicates what and where error happened.

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