已知龙骨的网格部件一些关键帧可能会导致转换工具转换失败，无法被spine读取 #24

spine logs日志：
jH: Error reading animation: skill
at lN.a(SourceFile:302)
at mm.a(SourceFile:139)
at xi.a(SourceFile:163)
at xm.run(SourceFile:140)
at uz.a(SourceFile:1658)
at xi.b(SourceFile:133)
at fG.a(SourceFile:92)
at gR.a(SourceFile:28)
at eX.a(SourceFile:182)
at eX.a(SourceFile:153)
at com.badlogic.gdx.scenes.scene2d.ui.Button.b(SourceFile:131)
at fz.a(SourceFile:94)
at gT.a(SourceFile:88)
at fd.a(SourceFile:59)
at ff.b(SourceFile:350)
at p.b(SourceFile:96)
at aC.a(SourceFile:332)
at ao.run(SourceFile:238)
at java.desktop/java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.desktop/java.awt.EventQueue.access$600(Unknown Source)
at java.desktop/java.awt.EventQueue$4.run(Unknown Source)
at java.desktop/java.awt.EventQueue$4.run(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.desktop/java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.run(Unknown Source)
Caused by: jH: Skin not found:
at lN.a(SourceFile:641)
at lN.a(SourceFile:300)
... 31 more