Fixed NPE error when using a single 'None' texture type in the material definition.

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@9342 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/blender/com/jme3/scene/plugins/blender/materials/MaterialContext.java

@@ -126,15 +126,12 @@ public final class MaterialContext {
 		TextureHelper textureHelper = blenderContext.getHelper(TextureHelper.class);
 		for(Entry<Number, List<TextureData>> entry : textureDataMap.entrySet()) {
 			if(entry.getValue().size()>0) {
-				CombinedTexture combinedTexture = loadedTextures.get(entry.getKey());
+				CombinedTexture combinedTexture = new CombinedTexture();
-				if(combinedTexture == null) {
-					combinedTexture = new CombinedTexture();
-					loadedTextures.put(entry.getKey(), combinedTexture);
-				}
 				for(TextureData textureData : entry.getValue()) {
 					int texflag = ((Number) textureData.mtex.getFieldValue("texflag")).intValue();
 					boolean negateTexture = (texflag & 0x04) != 0;
 					Texture texture = textureHelper.getTexture(textureData.textureStructure, textureData.mtex, blenderContext);
+					if(texture != null) {
 						int blendType = ((Number) textureData.mtex.getFieldValue("blendtype")).intValue();
 						float[] color = new float[] { ((Number) textureData.mtex.getFieldValue("r")).floatValue(), 
 													  ((Number) textureData.mtex.getFieldValue("g")).floatValue(), 
@@ -145,6 +142,10 @@ public final class MaterialContext {
 						combinedTexture.add(texture, textureBlender, textureData.uvCoordinatesType, textureData.projectionType, textureData.textureStructure, blenderContext);
 					}
 				}
+				if(combinedTexture.getTexturesCount() > 0) {
+					loadedTextures.put(entry.getKey(), combinedTexture);
+				}
+			}
 		}
 
 		//veryfying if  the transparency is present

engine/src/blender/com/jme3/scene/plugins/blender/textures/CombinedTexture.java

@@ -211,6 +211,13 @@ public class CombinedTexture {
 		return resultUVS;
 	}
 	
+	/**
+	 * @return the amount of added textures
+	 */
+	public int getTexturesCount() {
+		return textureDatas.size();
+	}
+
 	/**
 	 * This method merges two given textures. The result is stored in the
 	 * 'target' texture.