FormText.paint(): don't pass (0,0) to Image constructor

Fixes #3087

Author: iloveeclipse

bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/widgets/FormText.java

@@ -1549,12 +1549,16 @@ private void ensureBoldFontPresent(Font regularFont) {
 	}
 
 	private void paint(PaintEvent e) {
+		Point size = getSize();
+		if (size.x == 0 && size.y == 0) {
+			// avoids crash on image creation
+			return;
+		}
 		GC gc = e.gc;
 		gc.setFont(getFont());
 		ensureBoldFontPresent(getFont());
 		gc.setForeground(getForeground());
 		gc.setBackground(getBackground());
-		Point size = getSize();
 		repaint(gc, 0, 0, size.x, size.y);
 	}