More Tests and fixes

- Batteries will now get charged with no consumers
- Fixed stat display of power generators

core/src/io/anuke/mindustry/world/blocks/power/PowerGenerator.java

@@ -22,7 +22,7 @@ public class PowerGenerator extends PowerDistributor{
     @Override
     public void setStats(){
         super.setStats();
-        stats.add(generationType, powerProduction, StatUnit.powerSecond);
+        stats.add(generationType, powerProduction * 60.0f, StatUnit.powerSecond);
     }
 
     @Override

core/src/io/anuke/mindustry/world/blocks/power/PowerGraph.java

@@ -132,7 +132,7 @@ public class PowerGraph{
     }
 
     public void update(){
-        if(threads.getFrameID() == lastFrameUpdated || consumers.size == 0 || producers.size == 0){
+        if(threads.getFrameID() == lastFrameUpdated || consumers.size == 0 && producers.size == 0 && batteries.size == 0){
             return;
         }