fix: dilutions are not recognised if the layout files has holes

[Fersoil]

Checklist

• I added a very descriptive title to this issue.
• I used the GitHub search to find a similar question and didn't find it.
• I am sure that this is a bug in PvSTATEM package rather than my code.
• The bug is not resolved by updating to the latest stable version of PvSTATEM package.
• I included a link to the documentation page I am referring to (if applicable).

Reproduction steps

In case there are some holes in the layout file (e.g. the A2 well is empty but A3 contains a sample), the dilutions are improperly recognised.

require(PvSTATEM)

source = "clean_153PLEX_bruel_12062024_RUN000.csv"
layout = "clean_layout_Bruel_dec2024.xlsx"
plate <- read_luminex_data(source, layout)

summary(plate)

The given plate files come from the December 153 plex study

Error Message and Stack Trace (if applicable)

there are only 2 standard curve values recognised

OS

No response