cesium 版本1.67 iserver版本10i
错误如下：
An error occurred while rendering. Rendering has stopped.
undefined
TypeError: Cannot read property 'west' of undefined
TypeError: Cannot read property 'west' of undefined
at Rc._createTileImagerySkeletons (eval at <anonymous> (http://localhost:8551/static/Cesium/Cesium.js:26:1), <anonymous>:1:4637201)
at Qd.processImagery (eval at <anonymous> (http://localhost:8551/static/Cesium/Cesium.js:26:1), <anonymous>:1:4803062)
at Function.Qd.processStateMachine (eval at <anonymous> (http://localhost:8551/static/Cesium/Cesium.js:26:1), <anonymous>:1:4802351)
at Wc.loadTile (eval at <anonymous> (http://localhost:8551/static/Cesium/Cesium.js:26:1), <anonymous>:1:4818461)
at CY (eval at <anonymous> (http://localhost:8551/static/Cesium/Cesium.js:26:1), <anonymous>:1:1313442)
at $k.endFrame (eval at <anonymous> (http://localhost:8551/static/Cesium/Cesium.js:26:1), <anonymous>:1:5149069)
at rf.endFrame (eval at <anonymous> (http://localhost:8551/static/Cesium/Cesium.js:26:1), <anonymous>:1:5172422)
at ULa (eval at <anonymous> (http://localhost:8551/static/Cesium/Cesium.js:26:1), <anonymous>:1:1505790)
at fv (eval at <anonymous> (http://localhost:8551/static/Cesium/Cesium.js:26:1), <anonymous>:1:1506323)
at Fc.render (eval at <anonymous> (http://localhost:8551/static/Cesium/Cesium.js:26:1), <anonymous>:1:5505262)
