Introduce a self-explaining convenience method for empty images

Author: travkin79

org.eclipse.lsp4e/src/org/eclipse/lsp4e/ui/LSPImages.java

@@ -239,6 +239,15 @@ private record ImageWithOverlaysKey(String baseImageKey,
 			@Nullable ImageDescriptor overlayBottomLeftDescriptor, @Nullable ImageDescriptor overlayBottomRightDescriptor,
 			@Nullable ImageDescriptor underlayDescriptor) {}
 
+	/**
+	 * Returns an empty fallback image f(16x16 pixels).
+	 *
+	 * @return an empty 16x16 icon
+	 */
+	public static Image getEmptyImage() {
+		return EMPTY_IMAGE;
+	}
+
 	/**
 	 * Returns the <code>Image</code> identified by the given key, or <code>null</code> if it does not exist.
 	 */
@@ -303,7 +312,7 @@ public static ImageRegistry getImageRegistry() {
 	 */
 	public static @Nullable Image imageFromSymbolKind(@Nullable SymbolKind kind) {
 		if (kind == null) {
-			return EMPTY_IMAGE;
+			return getEmptyImage();
 		}
 
 		String imgKey = imageKeyFromSymbolKind(kind);

org.eclipse.lsp4e/src/org/eclipse/lsp4e/ui/SymbolIconProvider.java

@@ -256,8 +256,7 @@ protected String getImageKeyFromSymbolKindWithVisibility(SymbolKind kind, List<S
 			final @Nullable List<SymbolTag> symbolTags, int severity, Object symbol) {
 
 		if (symbolKind == null) {
-			// return empty image
-			return LSPImages.imageFromSymbolKind(symbolKind);
+			return LSPImages.getEmptyImage();
 		}
 
 		final List<SymbolTag> finalSymbolTags = symbolTags != null ? symbolTags : Collections.emptyList();