Not working with extra spaces in styleName

[gauravkumar37]

When styleName contains extra spaces, the library doesn't work. In fact the entire output of the component disappears rather than giving a warning.
Extra spaces can be present as a result of conditional styles.
For example, when isLoggedIn is false, the resulting string becomes class1 (with an extra space at the end).

<div styleName={'class1 ' + (isLoggedIn ? 'green' : '')}>Hi</div>

Of course, this can very easily be worked around by moving the space from class1 to isLoggedIn.

I believe empty strings should be filtered out after splitting on space in

react-css-modules.macro/src/macro.js

Lines 97 to 99 in f3a53bc

	const stringValueReplacement = styleNameAttr.value.value
	.split(" ")
	.map(val => t.stringLiteral(val));

[bohdanbirdie]

Hi!
Yep, good catch
Would you like to create a PR?
I will be glad to merge it ;)