phpstan, rector, phpcs fixes

src/Bundle/ChillEventBundle/Entity/Event.php

@@ -200,7 +200,7 @@ class Event implements HasCenterInterface, HasScopeInterface, TrackCreationInter
         $this->animators->removeElement($tp);
     }
 
-    public function getCenter(): ?Center
+    public function getCenter(): Center
     {
         return $this->center;
     }

src/Bundle/ChillEventBundle/Entity/EventBudgetElement.php

@@ -52,6 +52,7 @@ class EventBudgetElement
     {
         $this->id = $id;
     }
+
     public function getAmount(): float
     {
         return (float) $this->amount;

src/Bundle/ChillEventBundle/Entity/EventTheme.php

@@ -80,24 +80,14 @@ class EventTheme
         return $this->name;
     }
 
-    /**
-     * Set active.
-     *
-     * @return EventTheme
-     */
-    public function setIsActive(bool $active): static
+    public function setIsActive(bool $active): self
     {
         $this->isActive = $active;
 
         return $this;
     }
 
-    /**
-     * Set label.
-     *
-     * @return EventTheme
-     */
-    public function setName(array $label): static
+    public function setName(array $label): self
     {
         $this->name = $label;
 
@@ -130,23 +120,9 @@ class EventTheme
         return $this->children;
     }
 
-    public function getDescendants(): Collection
+    public function hasChildren(): bool
     {
-        $descendants = new ArrayCollection();
-
-        foreach ($this->getChildren() as $child) {
-            if (!$descendants->contains($child)) {
-                $descendants->add($child);
-
-                foreach ($child->getDescendants() as $descendantsOfChild) {
-                    if (!$descendants->contains($descendantsOfChild)) {
-                        $descendants->add($descendantsOfChild);
-                    }
-                }
-            }
-        }
-
-        return $descendants;
+        return 0 < $this->getChildren()->count();
     }
 
     public function hasParent(): bool