Dashboard has error at saving, but still generates a FusionTable resource

**Description**
I was trying to add a new Dashboard in the bbp/mouselight Studios, but I tried a couple of times and it displayed an error.
However, I copied the same query to the "Query" tab and it was a valid query, returning what I wanted.
Also, I noticed that multiple FusionTable resources were created, with empty queries. See attached images.

**What part of Nexus is affected**
- [x] Fusion
- [ ] Delta
- [ ] CLI
- [ ] Documentation

**To Reproduce**
Steps to reproduce the behavior, e.g. for Fusion:
1. Go to 'bbp/mouselight Studio
2. Click on 'Dashboard' / 'Add'
3. Select Sparql index
4. Add name
5. Copy the following query:
```
PREFIX nxv:
PREFIX nsg:
PREFIX schema:
PREFIX prov:
PREFIX rdf:
PREFIX rdfs:
PREFIX skos:
PREFIX vocab:

SELECT DISTINCT ?self ?name ?brainRegion ?subjectSpecies ?subjectStrain ?xCoordinate ?yCoordinate ?zCoordinate (STRAFTER(?atlas_identifier_, "data/") AS ?atlasIdentifier) ?contributor (STRAFTER(?registered_by_str, "users/") AS ?registeredBy) ?registeredAt
WHERE {
?entity nxv:self ?self ;
a nsg:NeuronMorphology ;
nxv:deprecated false ;
schema:name ?name ;
nxv:createdBy ?registered_by ;
nxv:createdBy ;
nxv:createdAt ?registeredAt .
OPTIONAL { ?entity nsg:contribution / prov:agent / schema:name ?contributor } .
OPTIONAL { ?entity nsg:subject / schema:name ?subjectName } .
OPTIONAL { ?entity nsg:subject / nsg:species / rdfs:label ?subjectSpecies } .
OPTIONAL { ?entity nsg:subject / nsg:strain / rdfs:label ?subjectStrain } .
OPTIONAL { ?entity nsg:brainLocation / nsg:coordinatesInBrainAtlas / nsg:valueX ?xCoordinate ;
nsg:brainLocation / nsg:coordinatesInBrainAtlas / nsg:valueY ?yCoordinate ;
nsg:brainLocation / nsg:coordinatesInBrainAtlas / nsg:valueZ ?zCoordinate} .
OPTIONAL { ?entity nsg:brainLocation / nsg:atlasSpatialReferenceSystem ?atlas_identifier } .
BIND (STR(?registered_by) AS ?registered_by_str) .
BIND (STR(?atlas_identifier) AS ?atlas_identifier_) .
GRAPH ?g {
OPTIONAL {
?entity nsg:brainLocation / nsg:brainRegion / rdfs:label ?brainRegion .
}
}
}
LIMIT 2000
```
6. Click on Configure Columns
7. Click on Save

**Screenshots**


Start with the Fusion Dashboard save flow described in the reproduction steps, then inspect how saving sends the query and creates FusionTable resources. Reproduce the failure using the supplied query and check whether the error path leaves empty resources behind. Done means a valid dashboard saves without an error and does not create duplicate empty resources.

Written by the indexing model from the issue text.