[Bug] Technique/tactic seems malformed

Expected Behavior

Using the exporters such as Excel or SVG using a local json file like https://github.com/mitre-attack/attack-stix-data/blob/master/enterprise-attack/enterprise-attack.json source should retrieve the proper data and produce the expected exported output with an output layer.

Actual Behavior

Every technique and subtechnique I was testing worked perfectly expect for this one : T1078.004

The error message is :
WARNING! Technique/Tactic T1078.004/(none) seems malformed. Skipping...

Steps to Reproduce the Problem

from mitreattack.navlayers.core import Layer
from mitreattack.navlayers.exporters.to_excel import ToExcel

lay = Layer()
lay.from_file("C:path_to_layer.json")

t2 = ToExcel(domain='enterprise', source='local', resource='path_to_enterprise-attack.json')
t2.to_xlsx(layerInit=lay, filepath="demo.xlsx")

The layer i'm using is

{
    "name": "example layer",
    "domain": "enterprise-attack",
    "description": "demo xlsx",
    "versions": {
        "layer": "4.5",
        "attack": "16.1",
        "navigator": "5.1.0"
    },
    "filters": {
        "platforms": [
            "Windows",
            "macOS"
        ]
    },
    "sorting": 2,
    "layout": {
        "layout": "side",
        "showID": true,
        "showName": true,
        "showAggregateScores": true,
        "countUnscored": true,
        "aggregateFunction": "average",
        "expandedSubtechniques": "annotated"
    },
    "hideDisabled": false,
    "techniques": [
        {
            "techniqueID": "T1078",
            "color": "#00FF00",
            "showSubtechniques": true
        },
        {
            "techniqueID": "T1078.004",
            "comment": "https://attack.mitre.org/techniques/T1078/004/",
            "color": "#00FF00"
        }
    ],
    "gradient": {
        "colors": [
            "#ff6666",
            "#ffe766",
            "#8ec843"
        ],
        "minValue": 0,
        "maxValue": 100
    },
    "legendItems": [
        {
            "label": "Legend Item Label",
            "color": "#FF00FF"
        }
    ],
    "showTacticRowBackground": true,
    "tacticRowBackground": "#dddddd",
    "selectTechniquesAcrossTactics": false,
    "selectSubtechniquesWithParent": false,
    "selectVisibleTechniques": false,
    "metadata": [
        {
            "name": "layer metadata 1",
            "value": "layer metadata 1 value"
        },
        {
            "name": "layer metadata 2",
            "value": "layer metadata 2 value"
        }
    ]
}

Possible Solution

The problem is appearing here

                else:
                    parents = [x for x in layer.layer.techniques if x.techniqueID == tech.techniqueID.split(".")[0]]
                    if tech.tactic:
                        parents = [x for x in parents if x.tactic == tech.tactic]
                    if all([True if not x.showSubtechniques else False for x in parents]):
                        print(
                            "NOTE! Technique/Tactic " + tech.techniqueID + "/" + tac + " does not appear "
                            "to be visible in the matrix. Its parent appears to be hiding it."
                        )
                    else:
                        print(
                            "WARNING! Technique/Tactic " + tech.techniqueID + "/" + tac + " seems malformed. "
                            "Skipping..."
                        )

Start at the ToExcel exporter entry point and inspect the shown malformed-technique branch, especially how T1078.004 and its tactic are matched against the layer data. Reproduce the issue with the supplied layer and local enterprise-attack JSON. Done means exporting the layer includes T1078.004 in the output without the malformed warning.