Handle nan values under _validate_microstructure_input in parametric_study.py

[safeerehman]

🔍 Before submitting the issue

• I have searched among the existing issues
• I am using a Python virtual environment

🐞 Description of the bug

add_simulations_from_data_frame will not add any microstructure simulations which have the input cooling rate, thermal gradient, meltpool depth and meltpool width values as nan

📝 Steps to reproduce

Use any csv file with nan values for the input cooling rate, thermal gradient, meltpool depth and meltpool width columns.
Try importing the csv using ParametricStudy::import_csv_study()

💻 Which operating system are you using?

Windows

📀 Which ANSYS version are you using?

242

🐍 Which Python version are you using?

3.11

📦 Installed packages

-e git+https://github.com/ansys/pyadditive.git@b4fca05258567df6b721e0923e919650a9c49cbe#egg=ansys_additive_core
ansys-api-additive==1.6.7
ansys-api-platform-instancemanagement==1.0.0
ansys-platform-instancemanagement==1.1.2
bleach==6.1.0
bokeh==3.3.4
cachetools==5.3.2
certifi==2024.2.2
cfgv==3.4.0
chardet==5.2.0
charset-normalizer==3.3.2
colorama==0.4.6
contourpy==1.2.0
dill==0.3.8
distlib==0.3.8
filelock==3.13.1
google-api-core==2.17.1
google-api-python-client==2.118.0
google-auth==2.28.1
google-auth-httplib2==0.2.0
googleapis-common-protos==1.62.0
grpcio==1.60.1
grpcio-health-checking==1.60.1
httplib2==0.22.0
identify==2.5.35
idna==3.6
importlib-metadata==7.0.1
iniconfig==2.0.0
Jinja2==3.1.3
linkify-it-py==2.0.3
Markdown==3.5.2
markdown-it-py==3.0.0
MarkupSafe==2.1.5
mdit-py-plugins==0.4.0
mdurl==0.1.2
nodeenv==1.8.0
numpy==1.26.4
packaging==23.2
pandas==2.2.0
panel==1.3.8
param==2.0.2
pillow==10.2.0
platformdirs==4.2.0
plotly==5.19.0
pluggy==1.4.0
pre-commit==3.6.2
protobuf==4.25.3
pyasn1==0.5.1
pyasn1-modules==0.3.0
pyparsing==3.1.1
pyproject-api==1.6.1
pytest==8.0.1
python-dateutil==2.8.2
pytz==2024.1
pyviz_comms==3.0.1
PyYAML==6.0.1
requests==2.31.0
rsa==4.9
six==1.16.0
tenacity==8.2.3
tornado==6.4
tox==4.13.0
tqdm==4.66.2
typing_extensions==4.9.0
tzdata==2024.1
uc-micro-py==1.0.3
uritemplate==4.1.1
urllib3==2.2.1
virtualenv==20.25.0
webencodings==0.5.1
xyzservices==2023.10.1
zipp==3.17.0