doc/groovy/ShowNullExecutionResult.ipynb

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    "# Configure Display of `null`\n",
    "\n",
    "The `null` object in the JVM is by default displayed as `null`.  But if you prefer to show no result at all, you can configure that as follows:"
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    "com.twosigma.beakerx.kernel.Kernel.showNullExecutionResult = true;\n",
    "String seeNullString = null;\n",
    "seeNullString"
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    "com.twosigma.beakerx.kernel.Kernel.showNullExecutionResult = false;\n",
    "String noNullString = null;\n",
    "noNullString"
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