Avoid empty script output

scripts/hadoop-datanode-info.nse

@@ -46,7 +46,6 @@ action = function( host, port )
   stdnse.debug1("Status %s",response['status-line'] or "No Response")
   if response['status-line'] and response['status-line']:match("200%s+OK") and response['body']  then
     local body = response['body']:gsub("%%","%%%%")
-    stdnse.debug2("Body %s\n",body)
     if body:match("([^][\"]+)\">Log") then
       port.version.name = "hadoop-datanode"
       port.version.product = "Apache Hadoop"
@@ -55,6 +54,8 @@ action = function( host, port )
       stdnse.debug1("Logs %s",logs)
       result["Logs"] = logs
     end
+  end
+  if #result > 0 then
     return result
   end
 end

scripts/hadoop-jobtracker-info.nse

@@ -90,7 +90,9 @@ local get_userhistory = function( host, port )
       end
     end
   end
+  if #results > 0 then
     return results
+  end
 end
 local get_tasktrackers = function( host, port )
   local results = {}
@@ -174,6 +176,6 @@ action = function( host, port )
     port.version.name = "hadoop-jobtracker"
     port.version.product = "Apache Hadoop"
     nmap.set_port_version(host, port)
-  end
     return result
+  end
 end

scripts/hadoop-namenode-info.nse

@@ -174,7 +174,7 @@ action = function( host, port )
       port.version.name = "hadoop-namenode"
       port.version.product = "Apache Hadoop"
       nmap.set_port_version(host, port)
+      return result
     end
-    return stdnse.format_output(true, result)
   end
 end

scripts/hadoop-tasktracker-info.nse

@@ -74,7 +74,7 @@ action = function( host, port )
       port.version.name = "hadoop-tasktracker"
       port.version.product = "Apache Hadoop"
       nmap.set_port_version(host, port)
-    end
       return result
     end
+  end
 end

scripts/hbase-master-info.nse

@@ -140,6 +140,6 @@ action = function( host, port )
     port.version.name = "hbase-master"
     port.version.product = "Apache Hadoop Hbase"
     nmap.set_port_version(host, port)
-  end
     return result
+  end
 end