"Not mutated" samples are incorrectly classified as "Not profiled"

[fuzhaoyuan]

The problem:
Samples that are {profiled, not mutated} on gene EGFR-mutations are classified as {not profiled} in legacy backend.

To replicate:

1. Open study "brca_tcga_pan_can_atlas_2018"
2. In "Charts->Gene Specific", add "Mutations: Mutated vs Not Mutated" and "Putative copy-number alterations from GISTIC" for gene EGFR.
3. Select type {NA, HOMDEL} in "EGFR:Putative copy-number alterations from GISTIC"
4. Check the samples in "EGFR:Mutations: Mutated vs Not Mutated"

Additional information:

• It was found during the verification testing of ClickHouse implementation against legacy endpoint, samples are checked and they are indeed profiled based on my understanding.
• The issue should be inside endpoint "mutation-data-count" when it's classifying samples.