Update util.js
Resolved 'Cannot read property 'toLowerCase' of undefined' error
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@ -44,6 +44,8 @@ class Channel {
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}
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_getGroup(groupTitle) {
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if(!groupTitle) return ''
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const groupIndex = supportedGroups.map(g => g.toLowerCase()).indexOf(groupTitle.toLowerCase())
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if(groupIndex === -1) {
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