prevent NPE, check return value before use

[homberghp]

Check returned array value before using, avoiding NPE.

While working on an unrelated subject, I got an error notification that mentions an NPE in the modified file

Simply add a check of the return value before dereferencing it in the following for-each statement. The result is that no elements will be added to the list in the for-each loop, which looks okay to me in that case.

netbeans/ide/web.webkit.debugging/src/org/netbeans/modules/web/webkit/debugging/api/Runtime.java

Lines 75 to 80 in 68e420d

	}
	JSONArray array = (JSONArray)result.get("result"); // NOI18N
	for (Object o : array) {
	res.add(APIFactory.createPropertyDescriptor((JSONObject)o, webkit));
	}
	return res;

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[matthiasblaesing]

I suggest to reframe the commit message to:

Prevent NullPointerException in WebKit debugger code

Closes: #7828

[matthiasblaesing]

Please follow the style of the rest of the code and make this a full if-block.