Implemented #5851 properly

core/src/mindustry/core/NetServer.java

@@ -896,7 +896,7 @@ public class NetServer implements ApplicationListener{
     }
 
     String fixName(String name){
-        name = name.trim();
+        name = name.trim().replace("\n", "").replace("\t", "");
         if(name.equals("[") || name.equals("]")){
             return "";
         }

core/src/mindustry/world/Block.java

@@ -402,7 +402,7 @@ public class Block extends UnlockableContent{
             stats.add(Stat.health, health, StatUnit.none);
         }
 
-        if(canBeBuilt()){
+        if(canBeBuilt() && requirements.length > 0){
             stats.add(Stat.buildTime, buildCost / 60, StatUnit.seconds);
             stats.add(Stat.buildCost, StatValues.items(false, requirements));
         }