PDFLib: Avoid throwing with 0 font size

src/Adapter/PDFLib.php

@@ -1076,6 +1076,10 @@ public function image($img, $x, $y, $w, $h, $resolution = "normal")
 
     public function text($x, $y, $text, $font, $size, $color = [0, 0, 0], $word_spacing = 0, $char_spacing = 0, $angle = 0)
     {
+        if ($size == 0) {
+            return;
+        }
+
         $fh = $this->_load_font($font);
 
         $this->_pdf->setfont($fh, $size);
@@ -1126,6 +1130,10 @@ public function add_link($url, $x, $y, $width, $height)
 
     public function get_text_width($text, $font, $size, $word_spacing = 0.0, $letter_spacing = 0.0)
     {
+        if ($size == 0) {
+            return 0.0;
+        }
+
         $fh = $this->_load_font($font);
 
         // Determine the additional width due to extra spacing
@@ -1142,6 +1150,10 @@ public function get_text_width($text, $font, $size, $word_spacing = 0.0, $letter
 
     public function get_font_height($font, $size)
     {
+        if ($size == 0) {
+            return 0.0;
+        }
+
         $fh = $this->_load_font($font);
 
         $this->_pdf->setfont($fh, $size);