fixed bugs reported by PHPStan

Author: dg

src/Application/UI/Link.php

@@ -93,6 +93,7 @@ public function __toString(): string
 				throw $e;
 			}
 			trigger_error('Exception in ' . __METHOD__ . "(): {$e->getMessage()} in {$e->getFile()}:{$e->getLine()}", E_USER_ERROR);
+			return '';
 		}
 	}
 }

src/Bridges/ApplicationLatte/Template.php

@@ -73,6 +73,7 @@ public function __toString(): string
 				throw $e;
 			}
 			trigger_error('Exception in ' . __METHOD__ . "(): {$e->getMessage()} in {$e->getFile()}:{$e->getLine()}", E_USER_ERROR);
+			return '';
 		}
 	}