Prerequisites

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Description

Crashing Bug: using the Brush tool with globalToolSyncEnabled can cause the application to crash when a new element is enabled.

Steps to Reproduce

1. initialize csTools with { globalToolSyncEnabled: true }
2. enable an element and load an image
3. set the brush tool mode to "active"
4. set the brush tool mode to "passive"
5. enable a second element.

Expected behavior: [What you expected to happen]

The 2nd element should be enabled

Actual behavior: [What actually happened]

The application crashes with the following error.

Uncaught Error: updateImage: image has not been loaded yet
    at Module.<anonymous> (cornerstone.js:7603)
    at BrushTool.passiveCallback (cornerstoneTools.js:24482)
    at setToolModeForElement (cornerstoneTools.js:11614)
    at cornerstoneTools.js:11694
    at Array.forEach (<anonymous>)
    at _resolveInputConflicts (cornerstoneTools.js:11684)
    at setToolActiveForElement (cornerstoneTools.js:11430)
    at cornerstoneTools.js:10756
    at Array.forEach (<anonymous>)
    at _repeatGlobalToolHistory (cornerstoneTools.js:10753)