fix requestionImage() problem with Java2D

core/src/processing/core/PGraphicsJava2D.java

@@ -786,6 +786,9 @@ public class PGraphicsJava2D extends PGraphics /*PGraphics2D*/ {
   protected void imageImpl(PImage who,
                            float x1, float y1, float x2, float y2,
                            int u1, int v1, int u2, int v2) {
+    // Image not ready yet, or an error
+    if (who.width <= 0 || who.height <= 0) return;
+    
     if (who.getCache(this) == null) {
       //System.out.println("making new image cache");
       who.setCache(this, new ImageCache(who));

core/todo.txt

@@ -1,4 +1,6 @@
 0164 core
+X requestImage() causing problems with JAVA2D
+
 P1 _ OutOfMemoryError with ellipse() in P3D and OPENGL
 P1 _   http://dev.processing.org/bugs/show_bug.cgi?id=1086
 P4 _ point(x,y) ignores noStroke() (in some renderers)