Fix NPE in debug / output code

src/ac/ed/lurg/country/gams/GamsRasterOptimiser.java

@@ -69,7 +69,8 @@ public class GamsRasterOptimiser {
 		for (LandCoverType l : LandCoverType.values()) {
 			double total = 0;
 			for (LandUseItem a : areaRaster.values()) {
-				total += a.getLandCoverArea(l);
+				if (a != null)
+					total += a.getLandCoverArea(l);
 			}
 
 			LogWriter.printlnError("Total Area " + comment + ": " + l.getName() + ": " + total);
@@ -77,10 +78,12 @@ public class GamsRasterOptimiser {
 		
 		double protectedAreaIncMinNatural=0, suitableArea=0, protectedArea=0, unprotectedArea=0;
 		for (LandUseItem a : areaRaster.values()) {
-			protectedArea += a.getProtectedArea();
-			unprotectedArea += a.getUnprotectedArea();
-			protectedAreaIncMinNatural += a.getProtectedAreaIncMinNatural();
-			suitableArea += a.getSuitableLand();
+			if (a != null) {
+				protectedArea += a.getProtectedArea();
+				unprotectedArea += a.getUnprotectedArea();
+				protectedAreaIncMinNatural += a.getProtectedAreaIncMinNatural();
+				suitableArea += a.getSuitableLand();
+			}
 		}
 		LogWriter.println("Total protectedArea " + comment + ": " + protectedArea);
 		LogWriter.println("Total unprotectedArea " + comment + ": " + unprotectedArea);