Merge pull request #104 from adam-cowley/master

Throw Exception on empty query string.  Fixes #101

Author: ikwattro

src/Connection/Connection.php

@@ -107,6 +107,9 @@ public function createPipeline($query = null, $parameters = [], $tag = null)
     public function run($statement, $parameters = null, $tag = null)
     {
         $this->checkSession();
+        if (empty($statement)) {
+            throw new \InvalidArgumentException(sprintf('Expected a non-empty Cypher statement, got "%s"', $statement));
+        }
         $parameters = (array) $parameters;
 
         try {

tests/Integration/CypherIntegrationTest.php

@@ -57,4 +57,12 @@ public function testPathIsReturned()
         $this->assertInstanceOf(Path::class, $record1->get('p'));
         $this->assertInstanceOf(Path::class, $record2->get('p'));
     }
+
+    /**
+     * @expectedException InvalidArgumentException
+     */
+    public function testExceptionIsThrownOnEmptyStatement() {
+        $query = '';
+        $this->client->run($query);
+    }
 }