Add renderutil safety in unusual case an icon is missing

src/com/jaquadro/minecraft/storagedrawers/client/renderer/RenderUtil.java

@@ -137,6 +137,9 @@ public final class RenderUtil
     }
 
     public static void renderFaceYNegColorMult (RenderBlocks renderer, Block block, int x, int y, int z, IIcon icon, float r, float g, float b) {
+        if (icon == null)
+            return;
+
         Tessellator tessellator = Tessellator.instance;
         tessellator.setColorOpaque_F(.5f * r, .5f * g, .5f * b);
         if (renderer.blockAccess == null) {
@@ -154,6 +157,9 @@ public final class RenderUtil
     }
 
     public static void renderFaceYPosColorMult (RenderBlocks renderer, Block block, int x, int y, int z, IIcon icon, float r, float g, float b) {
+        if (icon == null)
+            return;
+
         Tessellator tessellator = Tessellator.instance;
         tessellator.setColorOpaque_F(1f * r, 1f * g, 1f * b);
         if (renderer.blockAccess == null) {
@@ -171,6 +177,9 @@ public final class RenderUtil
     }
 
     public static void renderFaceZNegColorMult (RenderBlocks renderer, Block block, int x, int y, int z, IIcon icon, float r, float g, float b) {
+        if (icon == null)
+            return;
+
         Tessellator tessellator = Tessellator.instance;
         tessellator.setColorOpaque_F(.8f * r, .8f * g, .8f * b);
         if (renderer.blockAccess == null) {
@@ -188,6 +197,9 @@ public final class RenderUtil
     }
 
     public static void renderFaceZPosColorMult (RenderBlocks renderer, Block block, int x, int y, int z, IIcon icon, float r, float g, float b) {
+        if (icon == null)
+            return;
+
         Tessellator tessellator = Tessellator.instance;
         tessellator.setColorOpaque_F(.8f * r, .8f * g, .8f * b);
         if (renderer.blockAccess == null) {
@@ -205,6 +217,9 @@ public final class RenderUtil
     }
 
     public static void renderFaceXNegColorMult (RenderBlocks renderer, Block block, int x, int y, int z, IIcon icon, float r, float g, float b) {
+        if (icon == null)
+            return;
+
         Tessellator tessellator = Tessellator.instance;
         tessellator.setColorOpaque_F(.6f * r, .6f * g, .6f * b);
         if (renderer.blockAccess == null) {
@@ -222,6 +237,9 @@ public final class RenderUtil
     }
 
     public static void renderFaceXPosColorMult (RenderBlocks renderer, Block block, int x, int y, int z, IIcon icon, float r, float g, float b) {
+        if (icon == null)
+            return;
+
         Tessellator tessellator = Tessellator.instance;
         tessellator.setColorOpaque_F(.6f * r, .6f * g, .6f * b);
         if (renderer.blockAccess == null) {