|  | @@ -128,6 +128,8 @@ export default defineComponent({
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				|  |  |            state.musicCategory = state.gradeList[0].children || [];
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				|  |  |            if (state.musicCategory.length > 0) {
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				|  |  |              forms.musicSheetCategoriesId = state.musicCategory[0].id;
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				|  |  | +          } else {
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				|  |  | +            forms.musicSheetCategoriesId = null;
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				|  |  |            }
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				|  |  |          } else {
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				|  |  |            state.musicCategory = [] as any;
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				|  | @@ -136,6 +138,8 @@ export default defineComponent({
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				|  |  |          state.musicCategory = list || [];
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				|  |  |          if (state.musicCategory.length > 0) {
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				|  |  |            forms.musicSheetCategoriesId = state.musicCategory[0].id;
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				|  |  | +        } else {
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				|  |  | +          forms.musicSheetCategoriesId = null;
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				|  |  |          }
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				|  |  |        }
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				|  |  |      };
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