fix(rgb-to-hex): fix trim function to handle falsy value(#270) (#287)

* fix(mathers): fix hasCss if style applied but jQuery returns null (#270)

* Revert "fix(mathers): fix hasCss if style applied but jQuery returns null (#270)"

This reverts commit eda8ac3.

* fix(rgb-to-hex): fix trim function to handle falsy value(#270)

projects/spectator/src/lib/internals/rgb-to-hex.ts

@@ -19,5 +19,5 @@ export function isHex(value: string): boolean {
 }
 
 export function trim(value: string): string {
- return value.replace(/\s/g, '');
+ return (value || '').replace(/\s/g, '');
 }