fix: 数据不存在导致的异常

src/views/spectrumAnalysis/components/Modals/BetaGammaModals/BetaGammaSpectrumModal.vue

@@ -68,7 +68,7 @@ export default {
           if (result) {
             const keys = ['sample', 'gasBg', 'detBg', 'qc']
             keys.forEach((key) => {
-              result[key] = result[key].join('\n')
+              result[key] = result[key] ? result[key].join('\n') : ''
             })
             this.content = result
           }