fix[ThemePicker]: fixed bug when oldVal is null (#1517)
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		@@ -18,7 +18,8 @@ export default {
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    }
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					    }
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  },
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					  },
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  watch: {
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					  watch: {
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    theme(val, oldVal) {
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					    theme(val) {
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					      const oldVal = this.theme
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      if (typeof val !== 'string') return
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					      if (typeof val !== 'string') return
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      const themeCluster = this.getThemeCluster(val.replace('#', ''))
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					      const themeCluster = this.getThemeCluster(val.replace('#', ''))
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      const originalCluster = this.getThemeCluster(oldVal.replace('#', ''))
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					      const originalCluster = this.getThemeCluster(oldVal.replace('#', ''))
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