add check before foreach

www/class/centreon-clapi/centreonRtDowntime.class.php

@@ -600,7 +600,7 @@ class CentreonRtDowntime extends CentreonObject
                 $unknownHg[] = $hg;
             }
         }
-
+        if (count($existingHg)) {
             foreach ($existingHg as $hg) {
                 $hostList = $this->hgObject->getHostsByHostgroupName($hg);
                 //check add services with host
@@ -616,7 +616,7 @@ class CentreonRtDowntime extends CentreonObject
                     );
                 }
             }
-
+        }
         if (count($unknownHg)) {
             throw new CentreonClapiException(self::OBJECT_NOT_FOUND . ' HG : ' . implode('|', $unknownHg));
         }
@@ -656,6 +656,7 @@ class CentreonRtDowntime extends CentreonObject
             }
         }
 
+        if (count($existingSg)) {
             foreach ($existingSg as $sg) {
                 $serviceList = $this->sgObject->getServicesByServicegroupName($sg);
                 foreach ($serviceList as $service) {
@@ -670,6 +671,7 @@ class CentreonRtDowntime extends CentreonObject
                     );
                 }
             }
+        }
 
         if (count($unknownSg)) {
             throw new CentreonClapiException(self::OBJECT_NOT_FOUND . ' SG : ' . implode('|', $unknownSg));
@@ -709,6 +711,7 @@ class CentreonRtDowntime extends CentreonObject
             }
         }
 
+        if (count($existingPoller)) {
             foreach ($existingPoller as $poller) {
                 $hostList = $this->instanceObject->getHostsByInstance($poller);
                 //check add services with host with true in last param
@@ -724,6 +727,7 @@ class CentreonRtDowntime extends CentreonObject
                     );
                 }
             }
+        }
 
         if (count($unknownPoller)) {
             throw new CentreonClapiException(self::OBJECT_NOT_FOUND . ' INSTANCE : ' . implode('|', $unknownPoller));