error handling changes

gfx_es2/draw_buffer.cpp

@@ -66,6 +66,10 @@ void DrawBuffer::End() {
 }
 
 void DrawBuffer::Flush(bool set_blend_state) {
+	if (!program_) {
+		ELOG("No program set!");
+		return;
+	}
 	glsl_bind(program_);
 	if (count_ == 0)
 		return;

ui/ui_context.cpp

@@ -84,7 +84,6 @@ Bounds UIContext::GetScissorBounds() {
 		return Bounds(0, 0, dp_xres, dp_yres);
 }
 
-
 void UIContext::ActivateTopScissor() {
 	if (scissorStack_.size()) {
 		const Bounds &bounds = scissorStack_.back();

ui/ui_screen.cpp

@@ -39,7 +39,8 @@ void UIScreen::render() {
 		screenManager()->getUIContext()->End();
 		screenManager()->getUIContext()->Flush();
 	} else {
-		ELOG("Tried to render without a view root");
+		// This isn't really an error if you customize the view a bit.
+		// ELOG("Tried to render without a view root");
 	}
 }