DBAL-144 - Dont throw exception when no primary key exists

lib/Doctrine/DBAL/Schema/Table.php

@@ -475,7 +475,7 @@ class Table extends AbstractAsset
         $pkCols = array();
         $fkCols = array();
 
-        if ($this->hasIndex($this->_primaryKeyName)) {
+        if ($this->hasPrimaryKey()) {
             $pkCols = $this->getPrimaryKey()->getColumns();
         }
         foreach ($this->getForeignKeys() AS $fk) {
@@ -520,10 +520,13 @@ class Table extends AbstractAsset
     }
 
     /**
-     * @return Index
+     * @return Index|null
      */
     public function getPrimaryKey()
     {
+        if (!$this->hasPrimaryKey()) {
+            return null;
+        }
         return $this->getIndex($this->_primaryKeyName);
     }
 

lib/Doctrine/DBAL/Schema/Visitor/Graphviz.php

@@ -99,7 +99,7 @@ class Graphviz implements \Doctrine\DBAL\Schema\Visitor\Visitor
             $label .= '<FONT COLOR="#2e3436" FACE="Helvetica" POINT-SIZE="12">' . $columnLabel . '</FONT>';
             $label .= '</TD><TD BORDER="0" ALIGN="LEFT" BGCOLOR="#eeeeec"><FONT COLOR="#2e3436" FACE="Helvetica" POINT-SIZE="10">' . strtolower($column->getType()) . '</FONT></TD>';
             $label .= '<TD BORDER="0" ALIGN="RIGHT" BGCOLOR="#eeeeec" PORT="col'.$column->getName().'">';
-            if (in_array($column->getName(), $table->getPrimaryKey()->getColumns())) {
+            if ($table->hasPrimaryKey() && in_array($column->getName(), $table->getPrimaryKey()->getColumns())) {
                 $label .= "\xe2\x9c\xb7";
             }
             $label .= '</TD></TR>';