Bug 505668 - NullPointerException in AbstractJSONSourceFormatter.getLineDelimiter

As IStructuredModel.getStructuredDocument() can return null, the according null-check is added

Signed-off-by: Victor Rubezhny <vrubezhny@redhat.com>

bundles/org.eclipse.wst.json.core/src/org/eclipse/wst/json/core/internal/format/AbstractJSONSourceFormatter.java

diff --git a/bundles/org.eclipse.wst.json.core/src/org/eclipse/wst/json/core/internal/format/AbstractJSONSourceFormatter.java b/bundles/org.eclipse.wst.json.core/src/org/eclipse/wst/json/core/internal/format/AbstractJSONSourceFormatter.java
index eabc11a..8d320bd 100644
--- a/bundles/org.eclipse.wst.json.core/src/org/eclipse/wst/json/core/internal/format/AbstractJSONSourceFormatter.java
+++ b/bundles/org.eclipse.wst.json.core/src/org/eclipse/wst/json/core/internal/format/AbstractJSONSourceFormatter.java
@@ -660,13 +660,15 @@
 	}
 
 	String getLineDelimiter(IJSONNode node) {
-		IJSONModel model = (node != null) ? node.getOwnerDocument().getModel()
-				: null;
-		return (model != null) ? model.getStructuredDocument()
-				.getLineDelimiter() : "\n"; //$NON-NLS-1$
-
-		// TODO : check whether to use model.getLineDelimiter() or
-		// model.getStructuredDocument().getLineDelimiter()
+		IJSONModel model = node != null ? 
+				node.getOwnerDocument().getModel() :
+					null;
+		IStructuredDocument structuredDocument = model != null ? 
+				model.getStructuredDocument() :
+					null;
+		return structuredDocument != null ?
+				structuredDocument.getLineDelimiter() :
+					"\n"; //$NON-NLS-1$
 	}
 
 	protected CompoundRegion[] getOutsideRegions(IStructuredDocument model,