fix: polykame SQL chyby a pliveme je zpatky s pridanym dotazem.

lib/severak/database/rows.php

@@ -226,9 +226,17 @@ class rows
 	public function execute(query $Q)
 	{
 		$this->log[] = $Q;
-		
-		$stmt = $this->pdo->prepare($Q->sql);
-		$stmt->execute($Q->params);
+
+		try {
+            $stmt = $this->pdo->prepare($Q->sql);
+            $stmt->execute($Q->params);
+        } catch (\PDOException $exception) {
+		    // TODO - toto elegantněji
+		    throw new usageException(
+		        $exception->getMessage() . ' : ' . PHP_EOL .
+		        $Q->interpolate()
+            );
+        }
 		
 		return $stmt;
 	}