Add Java exceptions to catch RS calls with no context or no surface.
diff --git a/graphics/java/android/renderscript/ProgramStore.java b/graphics/java/android/renderscript/ProgramStore.java
index 5cbe1b2..69be245 100644
--- a/graphics/java/android/renderscript/ProgramStore.java
+++ b/graphics/java/android/renderscript/ProgramStore.java
@@ -162,6 +162,7 @@
         }
 
         public ProgramStore create() {
+            mRS.validate();
             return internalCreate(mRS, this);
         }
     }