Merge branch '6463-new-lines' into 'develop'

Initialize new_lines array, #6463

Closes #6463

See merge request ispconfig/ispconfig3!1694

install/lib/install.lib.php

@@ -547,16 +547,15 @@ function remove_blank_lines($input, $file = 1){
 		$content = $input;
 	}
 	$lines = explode("\n", $content);
+	$new_lines = array();
 	if(!empty($lines)){
 		foreach($lines as $line){
 			if(trim($line) != '') $new_lines[] = $line;
 		}
 	}
-	if(is_array($new_lines)){
-		$content = implode("\n", $new_lines);
-	} else {
-		$content = '';
-	}
+
+	$content = implode("\n", $new_lines);
+
 	if($file){
 		wf($input, $content);
 	}else{

server/lib/classes/file.inc.php

@@ -118,16 +118,15 @@ class file{
 			$content = $input;
 		}
 		$lines = explode("\n", $content);
+		$new_lines = array();
 		if(!empty($lines)){
 			foreach($lines as $line){
 				if(trim($line) != '') $new_lines[] = $line;
 			}
 		}
-		if(is_array($new_lines)){
-			$content = implode("\n", $new_lines);
-		} else {
-			$content = '';
-		}
+
+		$content = implode("\n", $new_lines);
+
 		if($file){
 			$this->wf($input, $content);
 		} else {