Cannot invoke "org.openide.filesystems.FileObject.getMIMEType()"

### Apache NetBeans version

Apache NetBeans 17

### What happened

I'm getting a java.lang.NullPointerException when opening a .JSON file in NetBeans. Note the file opens correctly just this Silent Error is thrown.

The error is:
_Cannot invoke "org.openide.filesystems.FileObject.getMIMEType()" because "this.internalFo" is null_

I believe it is because there are no Code Templates for JSON and the Code Templates window is open. Although not tested, I believe the same error will be thrown if other Code Templates sections don't have any code templates defined.

### How to reproduce

1. Open the Code Templates window (_Window>Code Templates_)
2. Create a JSON file with some dummy JSON data and give the file the extension: .json
3. In _Tools>Options>Editor>Code Templates>JSON_ make sure there are no templates
4. Open the .json file in NetBeans.
5. Silent Error (**Unexpected Exception**) is thrown

### Did this work correctly in an earlier version?

No / Don't know

### Operating System

Linux Mint 19.3 Cinnamon - Linux Kernel 5.4.0-144-generic

### JDK

openjdk version "17.0.6" 2023-01-17 OpenJDK Runtime Environment (build 17.0.6+10-Ubuntu-0ubuntu118.04.1)

### Apache NetBeans packaging

Apache NetBeans provided installer

### Anything else

This error can be eliminated by adding a Code Template to the Code Templates (JSON) section.

### Are you willing to submit a pull request?

No

Start by reproducing the issue through Window > Code Templates, then open an empty JSON template section and a .json file as described. Trace the Code Templates window and JSON editor interaction that produces the internalFo null error; done means opening the file no longer throws the silent Unexpected Exception when the section has no templates.

Written by the indexing model from the issue text.