Bugfix: Error for updating Visual Changeset URL patterns #2296
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Fixes #2283
Bug was introduced on Mar 21 in https://github.com/growthbook/growthbook/pull/2062/files#diff-927559bb0a1c6030d6f19383870f6f89ca3d5537f91116531fb65f2e651ed46fR2303
This PR ensures that visual changes on a changeset are only overriden when provided with a non-empty list of visual changes. For the case we want to remove visual changes, there should be at minimum a visual change per variation that have all values (css, js, dom mutations) set as empty, which is existing behavior.