Added method littlefoot::Runner::isProgramValid()

modules/juce_blocks_basics/littlefoot/juce_LittleFootRunner.h

@@ -458,6 +458,9 @@ struct Runner
     /** */
     uint16 getProgramHeapSize() const noexcept          { return heapSize; }
 
+    /** */
+    bool isProgramValid() const noexcept                { return heapStart != nullptr; }
+
     /** */
     void setDataByte (uint32 index, uint8 value) noexcept
     {