EISDIR error when `paths.sources` directory name contains `.`

[AntonGulak]

Solidity Coverage crashes with the error "Error in plugin solidity-coverage: Error: EISDIR: illegal operation on a directory, read"

For example, if the contracts are in the ./Solidity-4.21 directory (crashes because of a dot in the folder name)

paths: {
sources: ./Solidity-4.21,
tests: "./test",
cache: "./cache",
artifacts: "./artifacts",
},

     HardhatPluginError: Error: EISDIR: illegal operation on a directory, read
     at SimpleTaskDefinition.action 
     solidity-coverage\plugins\hardhat.plugin.js:269:35

     at async Environment._runTaskDefinition 
     hardhat\src\internal\core\runtime-environment.ts:359:14

    at async Environment.ru
    hardhat\src\internal\core\runtime-environment.ts:192:14

    at async main
    hardhat\src\internal\cli\cli.ts:323:7

package versions:
"hardhat": "^2.22.1",
"solidity-coverage": "github:sc-forks/solidity-coverage#master"

[cgewecke]

Thanks again @AntonGulak! This should be fixed by #880.

[cgewecke]

Published in v0.8.12