Fix more PHP 8 warnings

Fixes #560 #618

Author: annda

helper/field.php

@@ -109,14 +109,14 @@ public function renderfield($params, Doku_Form $form, $formid)
      */
     protected function createValue()
     {
-        $preparedValue = $this->opt['value'];
+        $preparedValue = $this->opt['value'] ?? '';
 
         // page fields might need to be JSON encoded depending on usetitles config
         if (
             $this->column->getType() instanceof Page
             && $this->column->getType()->getConfig()['usetitles']
         ) {
-            $preparedValue = json_encode([$this->opt['value'], null]);
+            $preparedValue = json_encode([$preparedValue, null]);
         }
 
         $value = new Value($this->column, $preparedValue);

meta/ConfigParser.php

@@ -42,7 +42,7 @@ public function __construct($lines)
         );
         // parse info
         foreach ($lines as $line) {
-            list($key, $val) = $this->splitLine($line);
+            list($key, $val) = array_pad($this->splitLine($line), 2, '');
             if (!$key) continue;
 
             $logic = 'OR';

meta/SchemaBuilder.php

@@ -178,10 +178,10 @@ protected function updateColumns()
                 // we should probably have a list of fields at one place
                 $newEntry['config'] = $this->data['cols'][$column->getColref()]['config'];
                 $newEntry['label'] = $this->data['cols'][$column->getColref()]['label'];
-                $newEntry['ismulti'] = $this->data['cols'][$column->getColref()]['ismulti'];
+                $newEntry['ismulti'] = $this->data['cols'][$column->getColref()]['ismulti'] ?? 0;
                 $newEntry['class'] = $this->data['cols'][$column->getColref()]['class'];
                 $sort = $this->data['cols'][$column->getColref()]['sort'];
-                $enabled = (bool)$this->data['cols'][$column->getColref()]['isenabled'];
+                $enabled = (bool)($this->data['cols'][$column->getColref()]['isenabled'] ?? 0);
 
                 // when the type definition has changed, we create a new one
                 if (array_diff_assoc($oldEntry, $newEntry)) {
@@ -265,7 +265,7 @@ protected function addColumns()
             $newEntry = array();
             $newEntry['config'] = $column['config'] ?? '{}';
             $newEntry['label'] = $column['label'];
-            $newEntry['ismulti'] = $column['ismulti'];
+            $newEntry['ismulti'] = $column['ismulti'] ?? 0;
             $newEntry['class'] = $column['class'];
             $sort = $column['sort'];