[BUG] Scatter has problems with scalar data

[BambOoxX]

Details

For some reason, I may need to plot some scalar data using scatter in 2D and 3D.
However, with the following examples I get either an empty plot or a failure.

using Plots
scatter(1,2,3) # <-- shows and empty plot with 3 legends
scatter(1.,2.,3.) # <-- fails with message "ERROR: Cannot convert Float64 to series data for plotting"
scatter([1],[2],[3]) # <-- works as expected (but is cumbersome)

This seem to lie before backend action.

Backends

This bug occurs on ( insert x below )

Backend	yes	no	untested
gr (default)	x
pyplot			x
plotly			x
plotlyjs			x
pgfplotsx			x
inspectdr			x

Versions

Plots.jl version: 1.21.3
Backend version (]st -m <backend(s)>): N/A
Output of versioninfo():

Julia Version 1.6.2
Commit 1b93d53fc4 (2021-07-14 15:36 UTC)
Platform Info:
OS: Windows (x86_64-w64-mingw32)
CPU: 11th Gen Intel(R) Core(TM) i7-1185G7 @ 3.00GHz
WORD_SIZE: 64
LIBM: libopenlibm
LLVM: libLLVM-11.0.1 (ORCJIT, tigerlake)

[BeastyBlacksmith]

Same as #2129