public boolean headlessStorageContainsKey(String key) throws ImproperUseException {
		checkHeadlessStatus();
		return headless.storageContainsKey(key);
	}
Returns whether the specified key was stored in the HeadlessAnalyzer instance.

@param key  value of key to check for in Headless Analyzer instance
@return  true if the specified key exists
@throws ImproperUseException if not in headless mode or headless instance not set
@see #storeHeadlessValue(String, Object)
@see #getStoredHeadlessValue(String)
Ghidra/Features/Base/src/main/java/ghidra/app/util/headless/HeadlessScript.java