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Check before attempting to generate empty image

This causes a libpng warning then error, but print a better error message
Fixes #1016

--- a/include/gfx/main.hpp

+++ b/include/gfx/main.hpp

@@ -21,7 +21,7 @@

 #include "gfx/rgba.hpp"

 struct Options {

-	uint16_t reversedWidth = 0; // -r, in pixels

+	uint16_t reversedWidth = 0; // -r, in tiles

 	bool reverse() const { return reversedWidth != 0; }

 	bool useColorCurve = false; // -C

--- a/src/gfx/reverse.cpp

+++ b/src/gfx/reverse.cpp

@@ -122,6 +122,9 @@

 		options.verbosePrint(Options::VERB_INTERM, "Read %zu tilemap entries.\n", nbTileInstances);

 	}

+	if (nbTileInstances == 0) {

+		fatal("Cannot generate empty image");

+	}

 	if (nbTileInstances > options.maxNbTiles[0] + options.maxNbTiles[1]) {

 		warning("Read %zu tiles, more than the limit of %zu + %zu", nbTileInstances,

 		        options.maxNbTiles[0], options.maxNbTiles[1]);