Fix string index error (#84)

In new version of intellij `VirtualFile` return directory in some cases. Check for a directory is added.

close #82

Author: skibish

build.gradle

@@ -1,7 +1,7 @@
 plugins {
     id 'idea'
     id 'java'
-    id "org.jetbrains.intellij" version "0.1.10"
+    id "org.jetbrains.intellij" version "0.3.2"
     id 'net.researchgate.release' version '2.6.0'
 }
 

gradle.properties

@@ -1,7 +1,7 @@
 version=2.5.1-SNAPSHOT
 
 # Intellij SDK
-intellijSdkVersion=2017.2.2
+intellijSdkVersion=2018.1.4
 
 # Versions
 versionJunit=4.12

ui/jetbrains/src/main/java/com/neueda/jetbrains/plugin/graphdb/jetbrains/ui/datasource/interactions/GraphDbEditorsConsoleRootType.java

@@ -44,6 +44,10 @@ public String substituteName(@NotNull Project project, @NotNull VirtualFile file
     }
 
     private Optional<? extends DataSourceApi> getDataSource(@NotNull Project project, @NotNull VirtualFile file) {
+        if (file.isDirectory()) {
+            return Optional.empty();
+        }
+
         DataSourcesComponent component = project.getComponent(DataSourcesComponent.class);
         return component.getDataSourceContainer()
                    .findDataSource(NameUtil.extractDataSourceUUID(file.getName()));