Clear _blockingObserver field when it was never initialized
Follow-up to cc3fc42b0ab740d139b301089937608d4aa1f130
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@ -189,6 +189,7 @@ class ReaderInstance {
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catch {
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// Reader was closed before it could be initialized
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// No need to log this
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this._blockingObserver = null;
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}
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this._internalReader = this._iframeWindow.wrappedJSObject.createReader(Components.utils.cloneInto({
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