Dispatch empty query to server

This update ensures that empty query gets dispatched to server and expects it to handle it accordingly.

Author: injectives

driver/src/main/java/org/neo4j/driver/Query.java

@@ -25,10 +25,10 @@
 import org.neo4j.driver.util.Immutable;
 
 import static java.lang.String.format;
-import static org.neo4j.driver.internal.util.Iterables.newHashMapWithSize;
-import static org.neo4j.driver.internal.util.Preconditions.checkArgument;
 import static org.neo4j.driver.Values.ofValue;
 import static org.neo4j.driver.Values.value;
+import static org.neo4j.driver.internal.util.Iterables.newHashMapWithSize;
+import static org.neo4j.driver.internal.util.Preconditions.checkArgument;
 
 /**
  * The components of a Cypher query, containing the query text and parameter map.
@@ -201,7 +201,6 @@ public String toString()
     private static String validateQueryText(String query )
     {
         checkArgument( query != null, "Cypher query text should not be null" );
-        checkArgument( !query.isEmpty(), "Cypher query text should not be an empty string" );
         return query;
     }
 }

driver/src/test/java/org/neo4j/driver/QueryTest.java

@@ -25,6 +25,7 @@
 
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.junit.MatcherAssert.assertThat;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.neo4j.driver.Values.parameters;
 
@@ -121,8 +122,12 @@ void shouldProhibitNullQuery()
     }
 
     @Test
-    void shouldProhibitEmptyQuery()
+    void shouldAcceptEmptyQuery()
     {
-        assertThrows( IllegalArgumentException.class, () -> new Query( "" ) );
+        // when
+        Query query = new Query( "" );
+
+        // then
+        assertNotNull( query );
     }
 }