Fix SDLoss null weights array issue (#185)

Signed-off-by: AlexDBlack <blacka101@gmail.com>

nd4j/nd4j-backends/nd4j-api-parent/nd4j-api/src/main/java/org/nd4j/autodiff/samediff/ops/SDLoss.java

@@ -45,7 +45,7 @@ public class SDLoss extends SDOps {
      */
     private SDVariable getWeights(SDVariable weights, String name, SDVariable predictions){
         String weightName = (name == null) ? null : name + "/weight";
-        return (weights == null) ? null : sd.constant(weightName, Nd4j.scalar(predictions.dataType(), 1.0));
+        return (weights == null) ? sd.constant(weightName, Nd4j.scalar(predictions.dataType(), 1.0)) : weights;
     }
 
     /**

nd4j/nd4j-backends/nd4j-tests/src/test/java/org/nd4j/systeminfo/TestSystemInfo.java

@@ -17,9 +17,10 @@
 package org.nd4j.systeminfo;
 
 import org.junit.Test;
+import org.nd4j.BaseND4JTest;
 import org.nd4j.systeminfo.SystemInfo;
 
-public class TestSystemInfo {
+public class TestSystemInfo extends BaseND4JTest {
     @Test
     public void testSystemInfo(){
         SystemInfo.printSystemInfo();